MCQ Questions

Question No. 1

What is the difference between a transverse wave and a longitudinal wave?

Answer :

Question No. 2

Explain why longitudinal waves cannot be propagated in a vacuum.

Answer :

Question No. 3

A wave in a string is described by the function Y = (0.11 m) sin(20.0 t + 8.50 x), where x is in metres and t in seconds. Calculate the following for the wave:

Answer :

a) amplitude

b) wavelength

c) period

d) speed

Question No. 4

A passenger on a stationary cruiser boat on a lake observes water waves moving towards her with constant velocity. The wave function is Y = (9.25 cm) sin(0.38 x – 4.70 t), where x is in centimetres and t in seconds.

Answer :

a) What is the distance between two wave crests approaching her?

b) How many complete waves approach her in 20 s?

c) How fast are the waves approaching her?

Question No. 5

A sinusoidal wave of wavelength 0.45 m and amplitude 12.0 cm travels along a string in the positive x direction. A student notes it takes 2.0 s for one wave to go past him.

Answer :

a) Are the waves transverse or longitudinal?

b) Write down the wave function to describe this wave.

c) Sketch the wave at t = 0, showing at least two waves. Label the amplitude and wavelength.

Question No. 6

Which one of the following are longitudinal waves?

Answer :

microwaves

waves in a ripple tank

sound waves

radio waves

Question No. 7

The following diagram shows a particle P on a transverse wave travelling to the right. Which one of the following diagrams correctly shows the position of P after the wave has travelled for a time equal to one quarter of its period?

Answer :

A

B

C

D

Question No. 8

Which of the following statements are true? (i) Light waves are transverse waves. (ii) Light waves need a medium for propagation. (iii) Light waves can be represented by the wave function Y = A sin(2π/λ x – ωt)

Answer :

(i), (ii) and (iii)

(i) only

(i) and (ii) only

(i) and (iii) only

Question No. 9

For transverse waves moving with constant velocity, which one of the following depend on each other?

Answer :

amplitude and wavelength

wavelength and frequency

amplitude and frequency

amplitude, frequency and wavelength

Question No. 10

A wave on a string is described by the function: Y = (0.10 m) sin(8.40x – 30.0t) where x is measured in metres and t in seconds. The wavelength of this wave is given by:

Answer :

0.10 m

4.77 m

0.75 m

1.34 m

Chapter

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