Doppler effect can be observed by:
Correct answer: D. Both longitudinal and electromagnetic waves
- A. Longitudinal waves
- B. Electromagnetic waves
- C. Sound only
- D. Both longitudinal and electromagnetic waves
Explanation
Explanation: The Doppler effect occurs whenever there is relative motion between a source of waves and an observer. It applies to both longitudinal waves (like sound) and electromagnetic waves (like light).
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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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