An observer detects an apparent change in the frequency of sound waves produced by an airplane passing overhead . This phenomenon illustrates:

A ) the Doppler effect

B ) the refraction of sound waves

C ) an increase in wave amplitude

D ) an increase in wave intensity

Expert Solution

Waves are not a motion of mass, but they are able to transfer energy without the transfer of mass. There are many types of waves with different speeds and shapes.

The Doppler effect occurs with all types off waves, including light. It is a result of relative motion between a source of waves and an observer. As the distance between the source and the observer decreases, then the frequency of the source from the observer perspective would increase. As the distance increases, then the apparent frequency is decreased.

This phenomenon is shown in the real world with ambulance sirens. As the vehicle approaches, the apparent pitch of the siren is increased, as the vehicle passes, the apparent pitch would decreased.

The correct answer is A ) the Doppler effect is the phenomenon being illustrated in the question.

Heidi Singh answered 2 years ago

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