What is the doppler effect?
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2nd Jul, 2025
The Doppler effect is the change in frequency or wavelength of a wave for an observer moving relative to its source. It occurs with all types of waves, including sound waves and light waves. When a source of waves moves towards an observer, the observed frequency increases (wavelength decreases), and when it moves away, the observed frequency decreases (wavelength increases).
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14th Dec, 2021
Doppler effect is the shift in frequency of sound sources with respect to the observer. Doppler effect is observed in sound as well as a light wave. It was given by Johann Doppler in 1842.
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Write the apparent velocity definition.
The apparent velocity is the true velocity when the surface is parallel to the refractor.
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