Doppler effect applies to____________________?
Correct answer: C. both sound and light waves
- A. sound wave only
- B. light wave only
- C. both sound and light waves
- D. neither sound nor light wave
Explanation
The Doppler effect is the apparent change in frequency caused by relative motion between source and observer, and it applies to both mechanical sound waves and electromagnetic light waves. A student may choose sound only because the effect is commonly introduced using moving sirens, but relative motion also changes observed light frequency.
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Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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