Physics Waves ETEA 2022
PMDC Verified Question 84 of 125
The apparent change in the frequency of sound caused by the relative motion of either the source of sound or listener or both is called:
A
Compton effect
B
Zeeman effect
C
Stark effect
D
Doppler effect
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Doppler effect
Concept:

Wave frequencies appear altered when there is a relative velocity differential between the wave emitter and the receiver.

Solution:

  • When a police car speeds toward you, the sound waves compress, making the siren pitch sound higher. As it passes, the waves stretch out, lowering the pitch.


  • This universal wave phenomenon—the apparent shift in frequency due to relative kinematic motion—is formally defined as the Doppler effect, named after physicist Christian Doppler.


Why other options are incorrect:

The Compton effect is the scattering of X-rays by electrons. The Zeeman effect is the splitting of spectral lines in a magnetic field. The Stark effect is the splitting of spectral lines in an electric field.

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