Doppler effect is:
Correct answer: B. Change in frequency between source and observer
- A. Change in sound between source and observer
- B. Change in frequency between source and observer
- C. Change in wavelength between source and observer
- D. None of these
Explanation
The change in apparent frequency by the relative movement of wave source or observer is called the Doppler effect. An example of the doppler effect is passing an ambulance such that when it gets closer the pitch of its horn increases and then decreases as it passes away from the observer.
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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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