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TF025/2 TF025/2Engineering Physics Fizik KejuruteraanPaper 2 Kertas 2Semester II Semester IISession 2010/2011 Sesi 2010/201121j hours 2Yz jam

P t ~ P l J S T A K A A N ~ I " I I ' 10,","".\llA5'1[' ' ' ' . ' \ '[ " 1 H ~ N G

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BAHAGIAN MATRIKULASIKEMENTERIAN PELAJARAN MALAYSIAMATRICULATION DIVISION

MINISTRY OF EDUCATION A L A } ~ ) I A

PEPERIKSAAN SEMESTER PROGRAM MATRIKULASIMATRICULATION PROGRAMME EXAMINATION

FIZIK KEJURUTERAANKertas 2

2 jam 30 minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU.DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.

Kertas soalan ini mengandungi 21 halaman bercetak.

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ARAHAN KEPADA CALON:Kertas soalan ini mengandungi 8 soalan.Jawab mana-mana enam soalan. Hanya enam jawapan pertama akan diperiksa.Semuajawapan hendaklah ditulls pada bukujawapan yang disediakan. Gunakan muka suratbaru bagi nombor soalan yang berbeza.Kalkulator elektronik boleh digunakan.

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INSTRUCTIONS TO CANDIDATE:This question booklet consists of 8 questions.Answer any six questions. Only the first six answers will be graded.All answers must be written in the answer booklet provided. Use a new page for eachquestion.The use of electronic calculator is permitted.

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Jawab mana-mana enam soalan.

(a) Nyatakan hukum pembiasan Snell.[2 markah]

(b)

RAJAH 1RAJAH 1 menunjukkan satu sinar eahaya menuju bongkah kaea pada sudut60 dan keluar pada sisi bertentangan pada sudut {3. Panjang gelombangeahaya dalam udara dan kaea masing-masing ialah 589 nm dan 394 nm. Diberiindeks biasan udara ialah 1.00. Hitung(i) indeks biasan kaea.(ii) sudut a dan jJ.

[5 markah]

(c) Satu objck diletakkan 30 em di kiri kanta meniscus menumpu. Kanta diperbuatdaripada kaea dengan indeks biasan 1.50. Jejari kelengkungan bagi duapermukaan masing-masing ialah 20 em dan 40 em.(i) Hitungjarak fokus kanta.(ii) Hitung pembesaran imej.(iii) Nyatakan eiri-eiri imej.

[8 markah]

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Answer any six questions.

1 (a) State the Snell's law of refraction. [2 marks](b)

FIGURE 1

FIGURE 1 shows a ray of light incident at 60 on a glass block and exit onthe other side at angle /3. The wavelengths of the light in air and in glass are589 nm and 394 nm respectively. Given the refractive index of air is 1.00.Calculate(i) thc refract ive index of glass.(ii) the angles a and /3.

[5 marks](c) An object is placed 30 cm to the left of a converging meniscus lens. The lens

is made of glass with refractive index 1.50. The radii of curvature are 20 cmand 40 cm for the two surfaces of the lens respectively.(i) Calculate the focal length of the lens.(ii) Calculate the magnification of the image.(iii) State the characteristics of the image.

[8 marks]

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2 (a) (i) Nyatakan ciri sllmber cahaya koheren.(ii) Mengapakah sumber cahaya koheren mesti digllnakan dalam satu

eksperimen bagi mencerap corak interferens cahaya?

(iii) Lukis gambar rajah skema susunan eksperimen dwi-celah Young.(iv) Diberi jarak antara dua celah ialah 0.10 mm dan terletak sejauh 1.2 m

dari skrin. Hitung panjang gelombang yang digunakan j ika jarakpinggir cerah tertib kedua berada 1.41 em dari garis tengah.

[7 markah](b) (i) Apakah belauan cahaya?

(ii) Lukis satu graf keamatan cahaya, I lawan sudut belauan, B untukcorak belauan daripada celah tunggal.

(iii) Cahaya dengan panjang gelombang 632.8 nm dipancarkan ke atas satucelah selebar 0.30 mm dan membentuk carak belauan pada skrin yangterletak sejauh 1.0 m. Hitung lebar maksimum pusat.

[8 markah]

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2 (a) (i ) State the characteristic of coherent light sources.(ii) Why do coherent light sources are necessary in an experiment to

observe light interference pattern?

(iii) Draw a schemat ic diagram for the Young's double-slit experimentalset up.(iv) Given the distance between two slits is 0.10 mm and located 1.2 m

from the screen. Calculate the wavelength used if the second orderbright fringe is 1.41 cm from the center line.

[7 marks](b) (i) What is light diffraction?

(ii) Draw a graph of intensity of light, I against diffraction angle, efor thediffraction pattern from a single slit.

(iii) Light ofwavelength 632.8 nm falls on a 0.30 mm wide slit and forms adiffraction pattern on a screen 1.0 m away. Calculate the width of thecentral maximum.

[8 marks]

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3 (a) (i)(ii)

State Coulomb's law.Define electric field strength.

[2 marh]

(b) y (em)54321

- - - ~ - - - ~ - - - + - - - ~ - - - : -I I , \ II I I IQ2

- - - ~ - - - ~ - - - + - - - ~ - - - : -I I I I II I I I I

- - - ~ - - - ~ - - - + - - - ~ - - - : -I t I I I I r IQQJ I I I I I I- - - r - - - r - - -T - - - e - - - . I I I I II

I!. I..! I.2. IL

I I I I I

: : : :04 : x (em)01

I

I : ~ FIGURE 2

FIGURE 2 shows four charges, QI =+q, Q2 = +5q, Q3 = +3q and Q4 = -4 q ona Cartesian coordinate system.(i) Draw a labeled diagram to show all the forces acting on charge QI.

NOTE: Draw all the force vectors roughly according to their relativemagnitudes.

(ii) Determine the magnitude and direction of the resultant force oncharge Ql. Given q = 240 nCo

(iii) Calculate the electr ic field strength at point (4, 2) if charge (:!I isremoved.

(iv) Calculate the potential energy of the charge assembly if charge QI isremoved.

[13 marks]

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4 (a) (i) Takrifkan kerintangan.(ii) Hitung rintangan dawai nikrom sepanjang 48 em dan diameter 1.2 mm.

Kerintangan nikrom ialah 150 x 10-8 Q m.

(iii) Hitung kuasa elektrik dikeluarkan oleh dawai nikrom jika iadisambungkan kepada bateri 12 V.[6 markah]

(b)

810 V

h2.0 Q

I,h 2.on8y

6.0 Q 14 V

RAJAH 3RAJAH 3 menunjukkan litar terdiri daripada perintang dan bateri. Hitung(i) 11, h dan h(ii) beza keupayaan di antara titik Y dan Z.

[9 markah]

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5 (a) Bcrikan DUA sumber medan magnet.(2 markah]

(b)

h=2A- - - - . : . . . . . (F----- . . . . ::::=:::: . .------ - - - - RAJAH 4

RAJAH 4 mcnunjukkan satu gelung bulat bertcbat berjejari 40 em mcmbawaanlS 3 A pada arah lawan jam, dengan P ialah pusat gelung. Seutas dawai luruspanjang membawa arus 2 A ke kiri terletak sangat hampir dengan gelung.(i) Tentukan arah medan magnet yang dihasilkan oleh gelung dan dawai

di titik P.

(ii) Tentukan magnitud dan arah medan magnet paduan di P.(iii) Apakah yang akan berlaku kepada medan magnet paduan j ika arus

dalam dawai mengalir pada arah berlawanan?[9 markah]

(e) Ion hidrogen dengan laju 2 x 10 5 m s-l memasuki medan magnet 0.6 T padaarah positif x mengalami daya magnet pada arah positif z.(i) Tentukan arah medan magnet.

(ii) Hitung magnitud daya. [4 markah]

A

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(a) Give TWO sources of magnetic field. [2 marks](b)

h=2A- - - - ~ ( ~ - - _ . : : : : : : = = - - - - - - - - - - - FIGURE 4

FIGURE 4 shows an insulated circular loop of radius 40 cm carrying acurrent 01'3 A in anti-clockwise direction where P is the center of the loop.A long straight wire carrying a current of 2 A to the left lies very close to theloop.(i) Determine the directions of magnetic field produced by the loop and

the wire at point P.(ii) Determine the magnitude and direction of resultant magnetic field at P.(iii) What will happen to the resultant magnetic field if the current in the

wire flows in opposite direction?[9 marks]

(c) A hydrogen ion with a speed of 2 x 10 5 m s- I entering a magnetic field of0.6 T in the positive x direction and experiences a magnetic force in thepositive z direction.

0) Determine the direction of the magnetic field.Oi) Calculate the magnitude of the force.

[4 marks]

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6 (a) Menurut hukum Faraday, dge teraruh, cdalam solenoid diberikan olehdcDc=-Ndt

Jelaskan setiap simbol dan maksud persamaan tersebut.[3 markah]

(b)S Arah

pergerakan

RAJAHS

RAJAH S menunjukkan satu magnet bar sedang ditarik keluar dari tengahsatu gelung dawai. Tentukan arah an.lS teraruh dalam gelung jika dilihat dariatas. Jelaskan jawapan anda.

[3 markah](c) Satu dinamo mempunyai gegelung dengan 30 Jilitan dan luas keratan rentas

1200 cm2. Jumlah rintangan gegelung ialah 15.0 Q. Gegclung diputarkandalam medan magnet 0.8 T pada laju sudut 50 kitaran per saat.(i) Hitung arus maksimum dalam gegelung.(ii) Hitung tork maksimum yang perlu untuk mengekalkan putaran

gegelung.(iii) Tulis persamaan perubahan arus gegelung dalam fungsi masa.(iv) Lakar satu graf berlabel all.ls gegelung lawan masa. Tunjukkan arus

maksimum dan tempoh ayunan arus pada graf anda.[9 markah]

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6 (a) According to the Faraday's law, the induced emf, &in a solenoid is given bydcD&=-Ndt

Explain each symbol and the meaning of the equation. [3 marks](b)

Directionof motion

R

FIGURE 5FIGURE 5 shows a bar magnet is being pulled out from the center of a wireloop. Determine the direction of the induced current in the loop as seen fromabove. Explain your answer.

[3 marks](c) A dynamo has a 30 turns coil with cross-sectional area of 1200 cm2 and a total

resistance of 15.0 n. The coil rotates in a magnetic field of 0.8 T at an angularspeed of 50 revolutions per second.(i) Calculate the maximum current in the coil.(ii) Calculate the maximum torque that must be applied to keep the coil

turning.(iii) Write an equation for the variation of the current in the coil as a

function of time.(iv) Sketch a labeled graph of the current in the coil against time. Indicate

the maximum current and period of current oscillation on your graph.[9 marh]

....

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8 (a) (i)(ii)

Takrifkan cacat jisim.TakritKan pembelahan nukleus.

(iii) Hitung tenaga tindak balas berikut:14N+4H ---+ 17 0+IH7 2 e g I

Jisim : I-I = 1.00783 u1isim He = 4.00260 u1isil11 N = 14.00307 u1isim I ~ O = 16.99913 u

[7 markah]

(b) Satu contoh tindak balas pelakuran diberikan oleh!1E = 17.6 MeV

(i)(ii)

TakritKan tindak balas pelakuran.Mcngapakah tindak balas pelakuran boleh berlaku di matahari?

[4 market/?](c) (i)

(ii)Iulis persamaan umum bagi pereputan a dan pcreputan y.Senaraikan DUA penggunaan penyurih radioisotop.

[4 markah]

KERTASSOALANTAMAT

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8 (a) (i)(ii)(iii)

Define mass defect.Define nuclear fission.Calculate the energy of the following reaction:

(b)

Mass of :H = 1.00783 uMass of He = 4.00260 uMass of N = 14.00307 uMass of I ~ O = 16.99913 u

An example of fusion reaction is given by[7 marks]

!1E = 17.6 MeV

(c)

(i)(ii)

(i)

(ii)

Define fusion reaction.Why fusion reaction is possible in the sun?

Write the general equations for a-decay and y-decay.List TWO applications of radioisotope tracer.

[4 marks]

[4 marks]

END OF QUESTION BOOKLET