IGCSE Physics (0625) 3.1 General wave properties Paper 4

Question

(a) Fig. 6.1 represents the waveform of a sound wave. The wave is travelling at constant speed.

(i) On Fig. 6.1,

1. label with the letter X the marked distance corresponding to the amplitude of the wave,
2.label with the letter Y the marked distance corresponding to the wavelength of the wave.

(ii) State what happens to the amplitude and the wavelength of the wave if

1. the loudness of the sound is increased at constant pitch,
amplitude …………………………………………………………………………………………………….
wavelength …………………………………………………………………………………………………..

2.the pitch of the sound is increased at constant loudness.
amplitude …………………………………………………………………………………………………….
wavelength …………………………………………………………………………………………………..

(b) A ship uses pulses of sound to measure the depth of the sea beneath the ship. A sound pulse is transmitted into the sea and the echo from the sea-bed is received after 54 ms. The speed  of sound in seawater is 1500 m / s.

Calculate the depth of the sea beneath the ship.
depth =……………………………………………………..