Which of the following is not the case of Doppler's effect:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Except for B, all others are the cases of Doppler effect. A explains an observer moving away from a stationary source. C explains an observer moving toward a stationary source. D explains the source moving away from a stationary observer.
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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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