Which of the following is correct in Doppler’s effect in one dimensional motion of source and observer:-

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If source and observer are at rest and medium moves with increasing velocity in direction from source towards observer, then wavelength measured by observer remains constant.

If source is receding away from observer with constant acceleration starting from rest, then apparent frequency will continuously decrease.

If observer receding away from source which is emitting sound since very long, with constant acceleration starting from rest then apparent frequency will first decrease then increase and finally no frequency will be detected by observer.

If observer is moving towards source with constant acceleration starting from rest, then apparent frequency received by observer will continuously increase ( until the observer reaches the sources).

answer is B, C, D.

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Detailed Solution

$f = f_{o} \frac{v - v_{o}}{v - v_{s}}$
If the source is receding away, then $f = f_{o} \frac{v}{v + v_{s}}$ so, f decreases as $v_{s}$ increases
If the observer is receding away, then $f = f_{o} \frac{v - v_{o}}{v}$ so f decreases as $v_{o}$ increases but at high speed f will increase and at very high speeds no frequency will be detected.