Question

Consider the following sound waves marked A, B, C and D.

Figure

(a) Which two waves represent sounds of the same loudness but different pitch ?
(b) Which two waves represent sounds of the same frequency but different loudness ?
(c) State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies ?
(d) Which vibrating body/bodies could have generated the sound waves shown here ?

Answer 1

(a) A and D waves represent sounds of the same loudness but different pitch as both of them have same amplitude but different frequency.
(b) B and D waves represent sounds of same frequency but different loudness as both have same frequency but different amplitude.
(c) Same vibrating body can produce all the given sound waves.
(d) Tuning fork is a device that can produce sound waves of different frequencies and amplitudes. Therefore, all these sound waves can be generated by a tuning fork.