Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,476.

Which of the following waves are longitudinal waves?

I. Ripples on the surface of water
II. Waves produced by a tuning fork vibrating in air
III. Light waves
IV. Waves produced by a flute

A.

I and II only

B.

I and III only

C.

II and III only

D.

II and IV only

E.

III and IV only

Correct answer is D

No explanation has been provided for this answer.

3,477.

How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)

A.

36.67m

B.

74.25m

C.

148.50m

D.

297.00

E.

366.67m

Correct answer is C

v = 2x/t ∴ distance x = vt/2 = 148.5m

3,478.

Which of the following radiations have the highest frequency?

A.

Radio waves

B.

Light waves

C.

X-rays

D.

infra-red rays

E.

Ultraviolet rays

Correct answer is C

No explanation has been provided for this answer.

3,479.

The diagram above shows a waveform in which energy is transferred from A to B in a time of 2.5 x 10-3s. Calculate the frequency of the wave

A.

2.0 x 103Hz

B.

1.0 x 103Hz

C.

4.0 x 10-2Hz

D.

1.0 x 10-3Hz

E.

5.0 x 104Hz.

Correct answer is B

The waveform moved from A to B in \(2.5 \times 10^{-3}\) seconds.

From the diagram, A to B has \(2\frac{1}{2}\) complete oscillations between it, Therefore, the period of the oscillation is

\(\frac{2.5 \times 10^{-3}}{2.5} = 1 \times 10^{-3} s\)

\(Frequency = \frac{1}{Period}\)

= \(\frac{1}{1 \times 10^{-3}} = 1 \times 10^{3} Hz\)

3,480.

The change of the direction of a wavefront as a result of a change in the velocity of the wave in another medium is called

A.

refraction

B.

reflection

C.

diffraction

D.

polarization

Correct answer is A

No explanation has been provided for this answer.