Uji Selaras2 t5 Sem12008

7/27/2019 Uji Selaras2 t5 Sem12008

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Name :...................................................................................................Class :.....................

Teacher Name: ................................................................................

SULIT

4531

PHYSICS23 Apr .

2008

1.5 hours

MAKTAB RENDAH SAINS MARA ALOR GAJAH

STANDARDIZE TEST 2, SEMESTER 1, 2008

PHYSICS

1 hour and 30 minutes

SPACE ANSWER FOR SECTION A

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

INFORMATION FOR CANDIDATES For Examiners Use

1. This question paper consists of

three sections: Section A, Section B

and C

2. Answer all questions in section A.

Write your answers in a space

provided in front the question.3. Answer all questions in section B

and C. Write your answers on the

line provided at end of questions.

4. Show your working. It may help

you to get marks.

5. You may use a non-programmable

scientific calculator.

Section Question Full

Marks

Marks

A 1-20 20

B 1 5

2 8

3 74 8

C 5 12

Total 60

4

5

3

1


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This question paper consist of 18 printed pages and 0 non-printed pages

4531 Hak Cipta Unit Fizik, MRSM Alor Gajah, Melaka

The following information may be useful. The symbols have their usual meaning.

1. = vf

2. = ax/D

3. T = 1/f


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Section A

[20 marks]

Answer all question in this section.

1. One end of a slinky spring is moved backwards and forwards to produce a modelof a wave. What is the name an example of this type of wave?

2. The diagram shows the displacement-time graph of a wave particle oscillating ina medium when there is wave motion in the medium.

Diagram 1

If the velocity of the wave is 5.0 ms -1, what is the wavelength of the wave?A 2 m

B 5 m

C 10 m

D 20 m

Types of wave Example

A Transverse Sound waves

B Transverse Microwaves

C Longitudinal MicrowavesD Longitudinal Sound waves

Time/s

Displacement/cm

5

1 2 3


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3. The diagram shows the displacement- time graph of an oscillating system.

Diagram 2

The system which produces this graph is having a

A perpetual oscillationB damped oscillation

C forced oscillation

D resonance

4. The diagram shows a Bartons pendulum which consists of five simple

pendulums hanging on horizontal string. When P is pull and released, it will cause

the other four pendulums to oscillate

Diagram 3

Which pendulum A, B, C orD will oscillate with the largest amplitude when

pendulum P is oscillate?

displacement

time

P

A

B

C

D


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10. In a Youngs double-slit experiment, the separation of the fringes is 1.8 mm whena light of wavelength 500 nm is used. What will the separation of the fringes if the

light of wavelength 600nm is used?

A 1.52 mm

B 1.86 mm

C 2.16 mmD 2.48 mm

11. In order to obtain an interference pattern, the two sources must be coherent.Which of the following is not a characteristic about coherency of two sources?

A Constant phase difference

B Same frequencyC Same wavelength

D Same amplitude

12. In a Youngs double-slit experiment, blue fringes are formed on the screen when ablue light source is used. What will be observed if the blue light is replaced by a

red light source?

Fringe separation Number of fringes

A Decreases Increases

B Decreases DecreasesC Increases Increases

D Increases Decreases

13. Which of the following is a correct description of the pitch of sound waves?

A The pitch increases with the frequency of sound waves

B The pitch increases with the amplitude of sound wavesC The pitch increases with the wavelength of sound waves

D The pitch increases with the period of sound waves


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14. The diagram shows an electromagnetic spectrum.

P Q Infrared R S

Which of the following are P, Q, R and S?

P Q R S

A X-ray Ultra-violet Radio waves Microwaves

B Ultra-violet Visible light Microwaves Radio waves

C Ultra-violet Visible light Radio waves Microwaves

D X-ray Visible light Microwaves Radio waves

15. The transmission station sending radio waves round a hill, is shown in the figure

below. The house at the opposite side of the hill can receive the radio waves.

The phenomena involved is

A interference

B diffractionC refraction

D reflection

16 An interference pattern of two coherent water waves is shown in the figure

below.

Which points represents the constructive interference?

A Pand Q

B Pand R

C Q andR


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D P, Q, andR.

17 The front view of a ripple tank in which the depth decreases towards both sides isshown in the figure below. R is an iron bar.

Which of the following pattern of the wavefronts will be observed in the ripple tank?

A

B

C

18. The figure shows plane water approaching a slit between a slit between two obstacles.

What will happened to when the effect of the diffraction of the water wave isincreased?

A is decreased

B is increased

C is constant


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19. The shape of the refracted wave depends on the shape of the area of shallow water

over which the wave is passing. Which of the following diagrams shows therefraction of a water wave?

A

B

C

D

20 The figure shows sound waves produced by a tuning fork.

Find the wavelength of the sound waves. The wavelength of the sound waves is the

distance between

A A and B

B C and F

C D and F

D B and D


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Section B

[28 marks]

Answer all questions in this section

1. Figure 1.1 shows water waves approaching a barrier in a ripple tank. The

frequency of the vibrator is 25 Hz.

(a) (i) In Diagram 1, draw the waves and its direction of propagation after

it hits the barrier.[2 marks]

(ii) Compare the wavelength and the speed of the waves before and

after it hit the barrier.

[1 mark]

(b) Traditional fisherman often have difficulties to detect shoals of fish. To

overcome this problem, they use a modern technology to locate the shoalsof fish.

(i) Name one modern technology which fisherman use to detect

shoals of fish

[1 mark]

(ii) State one reasons why this technology is used instead of

conventional sound waves.

Barrier

Diagram 1


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[1 mark]

2. Diagram 2(i) shows the propagation of light waves from air to glass.

Diagram 2(ii) shows the propagation of water waves in a ripple tank from a deepto a shallow area.

Diagram 2(i) Diagram 2(ii)

a) State one common feature for the propagation of light waves and water waves

that could be deduced from Diagram 2(i) and 2(ii)

..

..

[1 mark]

b) What is the cause of the change you have observed in :

(i) Diagram 2(i)

[1 mark]

(ii) Diagram 2(ii)

.

[1 mark]

c) What happens to the wavelength of the water waves in Diagram 2(ii) as they

move from the deep to the shallow area? Give a reason for your answer.

.

.


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[2 marks]

d) Name the phenomenon.

.

.

[1 mark]

e) (i) Predict what would happen to the water wave at the deeper end of the

tank,if its frequency is increased.

..

[1 mark]

(ii) Give the reason for your answer.

..[1 mark]


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3. Diagram 3 shows the pattern of water waves moving towards a gap between twowalls at a water-theme park. The size of gap is 0.5 m.

Diagram 3

(a) Calculate the velocity of the water waves if the frequency is 5 Hz.

[2 marks]

(b) In Diagram 3, draw the pattern of water waves after passing through

the gap.

[2 marks]

(c) Name the wave phenomenon involved.

.

.

[1 mark](d) Explain how this phenomenon occurs.


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.

.

.

.

[2 marks]4. The frequencies of sound by two instruments, a gong and a whistle are studied

using a cathode ray oscilloscope (CRO). Figure 4.1 shows tracings produced by

sounds from the gong and the whistle.

Diagram 4.1

(a) What is meant by frequency?

[1 mark]

(b) Based on Diagram 4.1, compare the frequencies of sound waves producedby the gong and the whistle

..

[1 mark]

(c) Compare the magnitude of the following for sound waves produced by the

gong and the whistle.

(i) Velocity


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[1 mark]

(ii) Wavelength

[1 mark]

(d) The gong and the whistle are used to produce sound at p in the laboratory.

It is observed that sound by the gong can be heard clearly at Q, R and Soutside the laboratory but sound by the whistle can be heard clearly only

at Q and R but not clearly at S. The positions of P, Q, R and S are shown

in Diagram 4.2.

(i) Name the wave phenomenon which makes it possible for the sound bythe gong to be heard clearly at S.

..

[1 mark]

(ii) Based on answers in (c) and (d)(i), state the relationship between

wavelength and this wave phenomenon.

..

[1 mark]

(e) Sound wave with frequencies between 1 and 15 MHz are used for

detecting objects in the body. The instrument works optimally if the

wavelength of the sound waves used by instrument is equal to the sizeof the object.

If sound travels at 1540 ms-1 in tissues, calculate the minimum

frequency needed to detect 0.5 mm objects.

Laboratory

P

Q

R

S

Diagram 4.2


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[2 marks]

Section C

[12 Marks]

Answer all question in this section

5. A student carried out an experiment to study the interference of sound waves.

He wanted to study the relationship of the distance between two consecutive

instances of loud sound, x. The distance between the speakers, a and the

location where the sound is detected, D , is 5. 0 m.

5.0 m

Loud sound

x Soft sound

Loud sound

a

Soft sound

Loud sound


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The student plotted a graph of x against 1/a, as shown in the figure.

x / m

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5


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a) From the graph,

i) State the relationship between x and a

.

.

[1 mark]ii) Calculate the value of a if x= 2.0 m, show on the graph how you

determine the value.

[3 marks]

iii) Determine the gradient of the graph.

[3 marks]

b) Using the value of the gradient obtained in (a) (iii) and the equation

=D

ax, calculate the wavelength of the sound waves used in this

experiment.

[4 marks]

c) State one precaution in this experiment.

0

0.5

0.2 0.4 0.6 0.8 1.0 1 / m-1

a

1.2


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..

..[1 mark]

END OF QUESTIONS

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Uji Selaras2 t5 Sem12008