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Contoh Penandaan Nota

6.4 ANALYSING DIFFRACTION OF WAVES1. Diffraction of waves is ..........................................................................

2. The effect of diffraction is obvious only if

(a) the size of the aperture or obstacle is ..small / large enough.(b) the wavelength is small /large enough.

3. Frequency, wavelength and of waves do not change

4. The . of the waves are change

Diffraction of water waves

Exercise 6.4

1. The table shows the properties of diffracted water waves as they pass through agap. Choose the correct answers given into the blanks.

Properties of diffracted water waves After passing through a gap

Wavelength UnchangedSpeed Unchanged

Frequency Unchanged

the spreading out of waves when

they movethrough

a gap or around an obstacle.

largesmall

speed

direction o ro a ation and the attern

Unchanged Increased Decreased


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2. Complete the diagrams below by drawing the wavefronts to show the diffraction of water

waves.

From the diagram above,

1. The .(narrower/wider) the gap, the more the waves spread out.2. When the gap is much wider than the wavelength of the waves, there is .

(little/more) diffraction.

(b) Wider gap > (a) Narrow gap

(d) Narrow obstacle(c)Wider obstacle

little

incorrect

Please do correction

Checked16/1/09


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Contoh Penandaan Latihan

Part C : Essay Questions

1.

(i) (ii)Diagram 1.1

Diagram 1.1(i) shows the condition of a car moving at high velocity when itsuddenly crashes into a wall.

Diagram 1.1(ii) shows a tennis ball hit with racquet by a player.a) (i) What is the meaning ofmomentum?

(ii) Based on the observations of Diagram (i) and (ii), compare the

characteristics of car when it crashes into the wall and the tennis

ball when it is hit with a racquet. Hence, relate these characteristicsto clarify a physics concept, and name this concept.

b) Explain why a tennis player uses a taut racquet when playing.

c) In launching a rocket, a few technical problems have to be overcome

before the rocket can move upright to the sky. By using appropriatephysics concepts, describe the design of a rocket and the launch

techniques that can launch the rocket upright.

Answera) (i) p=mv

(ii) - shape of car changed but the shape of wall remained.- The shape of ball and the shape of the racquetstring was changed.

- The time taken of collision between the ball andracquet string more than the time taken whenthe car hit the wall.- The impulsive force will increase when the timeof collision increased.

- The concept is the impulsive force

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b) - To decrease the time of collision between the ball and

the racquet string.- Impulsive force will be increased.

- The player can hit the ball harder.- The velocity of ball will be increased.

c) Front of rocket torpedo shape: To decrease air friction

- Body of rocket made with strong material: To withstand high pressure

- Material must be of low density: To reduce the mass/weight

- Rocket fuel made in stages: To be ejectedto reduce mass

- Made of low heat capacity of materials1- :will not get hot easly

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ood lease do correct on

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16/3/09

contoh penandaan modul fizik

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