JAMB Physics Past Questions & Answers - Page 168

836.

The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?

the pressure is reduced

the sound waves are pumped out

the waves are absorbed in the inner walls

There is no more material medium

the air is disturbed

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

837.

What type of motion does the skin of a talking drum perform when its being struck with the drum stick?

random

rational

vibratory

translational

circular

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

838.

Which of the following statements about wave is not correct?

i. A wavefront is a line which contains all particles whose vibration are in phase.
ii. The direction of propagation of a wave is the link drawn parallel to the wavefront.
iii. A wavefront is a circle which is common to particles that are in the same state of disturbance

i only

ii only

i and ii only

i and iii only

ii and iii only

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

839.

Which of the following remains unchanged as light travels from one medium to the other?

i. speed.
ii. wavelength.
iii. frequency.

i only