Doppler's effect is not applicable for:
Correct answer: D. Standing waves
- A. Microwaves
- B. Electromagnetic waves
- C. Ultrasonic
- D. Standing waves
Explanation
Doppler shift concerns relative motion between source and observer of propagating waves. Standing waves are produced by superposition of equal opposing waves, not by relative motion, so Doppler notion doesn't apply.
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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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