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    Revision March 2013 Physics Form 5

    1. Figure shows a simple pendulum which consists of a bob of mass 40.0 g atthe end of a light inelastic string of length 20.0 cm. The pendulum makes 20complete oscillations in 5.0 s.

    (a) B using the letters !"B and # in the figure abo$estate the meaning of

    (i) e%uilibrium position

    ...............................................................................................................................................................................................................(&m)(ii) period

    ...............................................................................................................................................................................................................(&m)

    (b) 'hat is the fre%uenc of the oscillations of the pendulum

    (2m

    (c) 'hat is the fre%uenc of the oscillations of the pendulum when a bob of mass 50.0 g is used

    (2m(d) 'hat happens to the fre%uenc of the oscillations of the pendulum when the length of the pendulum is 0.0 cm

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)

    (e) !fter a while the pendulum stops to oscillate " e*plain wh

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)

    (f) +lot a graph displacement , time to show wh the pendulum stops to oscillate.

    (g) -tate the form of energ when the pendulum(i) at B

    ...............................................................................................................................................................................................................(&m)

    (ii) between B and #

    ...............................................................................................................................................................................................................(&m)

    1

    TUTORIAL 1 a

    CHAPTER 1: WAVES 1.1 understanding waes

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    !.! trolle rests on a horiontal frictionless surface and is connected to two wallsb two steel springs. The trolle $ibrates with its natural fre%uenc when it ispulled aside and released.

    (a) 'hat is meant b the natural fre%uenc

    ...............................................................................................................................................................................................................(&m)

    (b) 'hat will happen to the nature fre%uenc of theboth springs when(i) the steel springs are replaced b the cooper springs.

    ...............................................................................................................................................................................................................(&m)(ii) the number of trolle is increased.

    ...............................................................................................................................................................................................................(&m)(iii) the e*periment is conducted at the surface of the /oon.

    ...............................................................................................................................................................................................................(&m)

    (c) 'hen the amplitude of the $ibrations remain constant" draw" using the same a*es shown below" two displacement timegraphs to compare the $ibrations of the springs with one trolle and then with two trolles are used.

    (2m

    " ! student carries out an e*periment to find out the relationship betweenmass" m and the oscillation period" T of a piece of 1igsaw blade. The1igsaw blade is clamped at one end and a plasticine ball with mass" m isfi*ed at the other end as shown in figure below.

    The 1igsaw blade is displaced horiontall to one side and then releasedso that it oscillates. The time for 20 oscillations "t is taken b a stop watch.The e*periment is repeated b using plasticine balls with different masses.The results of the e*periment are shown in the table below.

    /ass"m k g

    Time for 20oscillations" t s

    +eriod" T s T2 s2

    0.& 2.0

    0.2 40.00.3 50.0

    0.4 5.0

    0.5 4.0

    0. 0.0

    (3m (a) #omplete the table abo$e.

    2

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    Revision March 2013 Physics Form 5

    (b) Based on the graph paper abo$e plot a graph T2 against

    (5m3

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    (c) Based on our graph state the relationship between T and m.

    ...............................................................................................................................................................................................................(&m)

    (d) 6etermine the $alue of(i) m when T 7 2.2 s

    (2m (ii) T when m 7 0.2 kg.

    (2m(e) -tate #ne precaution that should be taken during this e*periment.

    ...............................................................................................................................................................................................................(&m)

    1

    Figure &Figure 2

    Figure & shows a spring of load before and after the load is displaced and released to $ibrate on the surface of water.Figure 2 shows a candle flame is placed in front of a loudspeaker before and after the audiofre%uenc generator is switched onto prodeuce a sound.8bser$e Figure & and Figure 2.

    (a) (i) #ompare the condition of the water surface and candle flame when the load $ibrate and the audiofre%uencgenerator is switched on.

    ...............................................................................................................................................................................................................(&m)

    (ii) 9elate the obser$ations in (a)(i) and the transfer of eneg to deduce a concept in phsics with regard to the wa$e motion

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)

    4

    T UTORIAL 1 b

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    (b) (i) #ompare the direction of $ibration of theparticles and the direction of wa$e propagation.

    ...............................................................................................................................................................................................................(&m)(ii) Based on our answer in b(i) name the tpe of wa$e in

    Figure & ..............................................................................................................................................................................(&m)

    Figure 2 ..............................................................................................................................................................................(&m)

    ! The figure shows a graph displacementdistance for a trans$erse wa$e.

    (a) /ark on the graph(i) the direction of $ibration of the particles and the direction of wa$e propagation . (&m)(ii) two points $ibrate in phase. (&m)

    (b) :i$e #nee*ample of the trans$erse wa$e .

    ...............................................................................................................................................................................................................(&m)(c) 6etermine

    (i) the amplitude

    (&m (ii) the wa$elength

    (&m

    (d) 'hat is the speed of the wa$e when the fre%uenc is 25 ;.

    (2m

    (f) :i$e #nee*ampleofthe natural phenomenon to show that a wa$e transfer energ.

    ...............................................................................................................................................................................................................(&m)

    5

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    " The figure shows a student setting up wa$es on a long lastic cord . The studen

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    1 The figure shows plane water wa$es is produced b a $ibrating wooden bar $ibrates at a rate &5 wa$es per second.

    (a) From the figure abo$e(i) /ark the direction of the propagation of the water wa$es. (&m)

    (ii) 6etermine the wa$elength of the wa$es.

    >>>>>>>>>>>>>>>>(&m)(iii) #alculate the speed of the water wa$es.

    (2m(b) ! plane reflector is placed at different inclined angle in front of the water wa$es as shown in the following figure. 6raw the

    pattern of the reflected wa$e in the figure.(2m

    (i)(ii)

    ! 6etermine b wa of ra diagrams" the cars that can be seen b the dri$er through reflection of ras b the rear $iew mirror.

    7

    CHAPTER 1: WAVES 1.! re$%e&ti#n #$ waes

    T UTORIAL 1 c

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    (2m

    8CHAPTER 1: WAVES 1." re$ra&ti#n #$ waes

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    1 The figure shows successi$e wa$efronts of wa$es tra$elling on the surface of water a ripple tank.! perspe* plat is placed on the bottom of a ripple tank .

    (a) B drawing a straight line on the figure abo$e mark the boundar of the perspe* plat.

    (&m(b) (i) 6etermine the wa$elength of the wa$es before tra$els o$er the perspe* plat.

    (&m

    (ii) #alculate the fre%uenc of the wa$es before tra$els o$er the perspe* plat when the $elocit is 40 cms&.

    (2m(iii) 6etermine the $elocit of the wa$es tra$els o$er the perspe* plat.

    (2m

    (c) ?*plain wh the water wa$es propagated from the sea to the beach " the water wa$es follow the shape of the beach.

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)

    ! Figure & shows a water wa$es in a ripple tank tra$els o$er a perspe* plat.Figure 2 shows a water wa$es propagated from the sea to the beach.

    9

    T UTORIAL 1(d)

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    Figure & Figure 2(a) Based on Figure & and Figure 2(i) state the change in wa$elength of the water wa$es from ! to B.

    ...............................................................................................................................................................................................................(&m)

    (ii) compare the depth of water between ! and B.

    ...............................................................................................................................................................................................................(&m)(iii) name a phsical %uantit is unchanged .

    ...............................................................................................................................................................................................................(&m)(b) 9elate our answer in (a)(i) and (a)(ii) to deduce a wa$e phenomenon.

    ...............................................................................................................................................................................................................(&m)(c) @ame the phenomenon in (b)

    ...............................................................................................................................................................................................................(&m)(d) (e) The water wa$es with a wa$elength of &.5 m tra$els with $elocit 2.0 ms& from the sea to the beach. The $elocit

    of the wa$es when reach near the beach is &.2 ms&.#alculate "

    (i) the fre%uenc of the wa$es

    (2m)(ii) the wa$elength of the wa$es near the beach

    10

    CHAPTER 1: WAVES 1.' di$$ra&ti#n #$ waes

    T UTORIAL 1(e)

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    Revision March 2013 Physics Form 5

    1 Figure & shows a plane water wa$es of passing through a small slit.Figure 2 shows a plane water wa$es passing through a small obstacle.

    Figure & Figure 2

    (a) 8bser$e Figure & and Figure 2 and state tw# similarities of the wa$e patterns.

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)(b) 9elate our answers in (a) to deduce a rele$ant phsics concept and name the concept.

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(2m)

    ! The figure shows the bright and dark bands of the wa$e patterns formed on the screen when plane wa$es pass through narrowand wide slits.

    8bser$e the figure. #ompare the wa$e patterns and the wa$elengths of the wa$es before and after the pass through the slits.9elate the sie of slits" the wa$e patterns and the wa$elengths to deduce a rele$ant phsics concept.@ame the wa$e phenomenon shown in the figure.

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................

    .......................................................................................................................................................................................................................

    ...............................................................................................................................................................................................................

    ...............................................................................................................................................................................................................(5m)

    11

    CHAPTER 1: WAVES 1. inter$eren&e #$ waes

    T UTORIAL 1(f)

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    1 The figure shows a plane water wa$es approaches two small slits .

    (a) /ark a point where constructi$e interference occurs and a point where destructi$e interference occurs"

    (b) 'hat is another phenomenon in$ol$ed

    ...............................................................................................................................................................................................................(&m)(a) 'hen the fre%uenc of the $ibrator /@ is &2 ;" what is the speed of the water wa$es

    ! The figure shows the arrangement of apparatus to in$estigate the phenomena of light wa$es. The sodium$apour lamp isad1usted until the position of the lamp is at the focus point of the lense.

    (a) 'h is The sodium$apour lamp is ad1usted until the position of the lamp is at the focus point of the lense

    ...............................................................................................................................................................................................................(&m)

    (b) (i) n the bo* below "draw and label the pattern of image is formed on the screen.

    12

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    (ii) @ame the light phenomenon in$ol$ed.

    ...............................................................................................................................................................................................................(&m)(c) The single slit is replaced b a double slit of slit separation is 5 * &04m.

    (i) n the bo* below "draw and label the pattern of image is formed on the screen.

    (ii) @ame the light phenomenon in$ol$ed.

    ...............................................................................................................................................................................................................(&m)(iii) The light emits from the sodium$apour lamp with a wa$elength of .0 * &0m.#alculate the distance two consecuti$e

    bright fringes.

    (d) 'hen the e*periment is carried out in the water" what happen to

    (i) the wa$elength of the light wa$es

    ...............................................................................................................................................................................................................(&m)

    (ii) the distance two consecuti$e bright fringes.

    ...............................................................................................................................................................................................................(&m)

    " The figure shows the arrangement of apparatus in Coung

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    'hat happen to the distance two consecuti$e bright fringes when

    (i) the distance between the screen and the double slit is increased.

    ...............................................................................................................................................................................................................(&m)

    (ii) the slit separation is decreased

    ...............................................................................................................................................................................................................(&m)

    (iii) the blue light is replaced b a red light

    ...............................................................................................................................................................................................................(&m)

    (d) f 6 7 3.0 m " a7 5.2 * &0 ,3m " determine the wa$elength of the wa$e of the lights.

    4. The figure shows the pattern of the fringe formed on the screen from Coung

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    The figure shows the arrangement of apparatus in the interference wa$e of sounds e*periment. Two similar loudspeakers areplaced 2.0 m apart. ! source of sound is switched on to produce a sound of fre%uenc 2.4 k;! girl walks slowl along 8+ parallel to the two loudspeakers at a distance 5.0 m in front of the loudspeakers. -he hears loudsound at point ! "# and ? and alternatel weak sound at point B"# and 6.

    (a) @ame the source of the sound wa$es is used.

    ...............................................................................................................................................................................................................(&m)(b) Two loudspeakers is used to produce a coherent wa$e. 'hat is meant b a coherent wa$e

    ...............................................................................................................................................................................................................(&m)

    (c) @ame the wa$e phenomenon in$ol$ed.

    ...............................................................................................................................................................................................................(&m)

    (d) 'hat happen to the sound wa$e at point

    (i) !"# and ?

    ...............................................................................................................................................................................................................(&m)

    (ii) B"6 and F

    ...............................................................................................................................................................................................................(&m)

    (e) 'hen the speed of sound wa$es is 30 ms&" determine(i) the wa$elength of the sound wa$es.

    (ii) the distance !F

    15CHAPTER 1: WAVES 1. SOU*+ WAVES

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    1 ! bo stands at point + between two high walls + and =. Thedistance between + and T is &00 m and the distance

    From T and = is 500 m. ;e shouts in front of the high walls. ;ehears the echo of his $oicefrom the high wall + and2.5 secondslater he hears the echo of his $oice from the high wall =.

    (a) 'hat is meant b echo

    ......................................................................................................... (&m)(b) 6etermine the speed of the sound wa$es.

    (c) 'hen the distance between two high walls are increased what happen to(i) the speed of the sound wa$es.

    ...............................................................................................................................................................................................................(&m)(ii) the time taken to hear the echo

    ...............................................................................................................................................................................................................(&m)

    ! The figure shows ultrasound being used to stud an unborn bab.(a) 'hat is meant b ultrasound

    ......................................................................................................(&m)

    (b) ?*plain how the wa$es is used to scan the bab

    >>>>>>>>>>>>>>>>>>>>>>...............................

    >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    (c) 'h using this method to scan an unborn bab is safer than using Eras

    ...............................................................................................................................................................................................................(&m)

    (d) Dltrasound used in medicine has a fre%uenc which is about &00 times higher than the ma*imum fre%uenc that can be

    heard b humans. f the speed of ultrasound in the human bod is & 500 ms&

    " determine(i) the fre%uenc that might be used for ultrasound in medicine.

    (ii) the wa$elength of the ultrasound in the human bod.

    16

    T UTORIAL 1(g)

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    1 The figure shows the electromagnetic spectrum.

    (a) @ame the wa$es mark b

    (i) + >>>>>>>>>>>>>>>(ii) = >>>>>>>>>>>>>>>(iii) 9 >>>>>>>>>>>>>>..

    (b) 'hat is the speed of the electromagnetic wa$es in $acuum

    ...............................................................................................................................................................................................................(&m)(c) @ame an apparatus to detect gamma ras.

    ...............................................................................................................................................................................................................(&m)(d) @ame a source to produce =.

    ...............................................................................................................................................................................................................(&m)(e) @ame a wa$e can cause skin burns

    ...............................................................................................................................................................................................................(&m)(f) #omplete the following table.

    Dses ?lectromagnetic wa$e

    satellite transmissions

    to identif counterfeit notes

    3 The diagram represents the electromagnetic spectrum.

    (a) @ame the tpe of electromagnetic radiation that is used(i) to sterelise surgical instruments. >>>>>>>>>>>>>>>>..(ii) to send a signal to a TG from a remote control. >>>>>>>>>>>>>>>>..

    (b) Galuable item can be securit marked using special ink . The ink can onl be seen in ultra$iolet radiation

    ?*plain what happen to make this ink $isible?

    ...............................................................................................................................................................................................................(&m)(c) ?*plain wh skin cells need to be protected from ultra$iolet radiation

    17

    CHAPTER 1: WAVES 1., ELECTRO-A*ETIC WAVE

    T UTORIAL 1(h)

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    ...............................................................................................................................................................................................................(&m)

    18