In Dopplers effect, when a source moves towards a stationary observer, the apparent increase in frequency is due to

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none of the above, but due to something else

decrease in wave length of sound received by observer

increase in number of waves received by observer in one second

increase in wave length of sound received by observer

answer is B.

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Detailed Solution

When source moves towards a stationary observer, the same number of waves are contracted between smaller distance, so effective wavelength decreases and frequency increases.

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