The apparent change in the frequency of sound caused by the relative motion of either of source of sound or listener or both is called?
Correct answer: C. Doppler effect
- A. Zeeman effect
- B. Starkeffect
- C. Doppler effect
- D. Compton effect
Explanation
An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the redshift seen by astronomers.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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