Propagation of Sound Waves - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1983

A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms ^-1, how much closer is the ship to the cliff?

A. 10m
B. 125m
C. 175m
D. 350m
E. 1,000m

Question 7:

• JAMB 1985

In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms^-1, what is the depth of the sea?

A. 0.75km
B. 1.50km
C. 2.20km
D. 3.00km
E. 3.75km

Question 8:

• JAMB 1985

When a sound wave passes from air into water its

A. Speed and frequency increases but its wavelength remains the same
B. Speed and wavelength increases but its frequency remains the same
C. Speed decreases
D. Speed remains the same but its frequency and wavelength change
E. Speed increases but its frequency and wavelength decreases

Question 9:

• JAMB 1986

Which of the following is true of sounds?

A. Sound travels faster in air at 20^oC than at 30^oC
B. The frequency of a given sound wave changes when it crosses the boundary seperating two media
C. The wavelength of a given sound wave in air decreases as the temperature increases
D. Sound waves cannot be reflected

Question 10:

• JAMB 1986

Which of the following is true of the loudness of sound? It

A. Depends on the square of the amplitude of the vibrating body
B. Is proportional to the distance of the observer from the source of the sound
C. Is greatest in vacuum
D. Is dependent in vacuum