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Transverse & Longitudinal Waves

A fixed sourc...

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A fixed source of sound emitting a certain frequency appears as f_a when the observer is approaching the source with speed v and frequency f_r when the observer recedes from the source with same speed.The frequency of the source is how much

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Q. A fixed source of sound emitting a certain frequency appears as

f_{a}

when the observer is approaching the source with speed v and frequency

f_{r}

when the observer recedes from the source with the same speed. The frequency of the source is

Q. A fixed source of sound emitting a certain frequency appears as

f_{a}

when the observer is approaching the source with speed

v_{0}

f_{r}

when the observer recedes from the source with the same speed. The frequency of the source is

Q. The frequency changes by

20 %

as a source approaches a stationary observer with constant speed

v_{s}

. What would be the percentage change in frequency as the source recedes from the observer with the same speed? [Given,

v_{s} << v

(velocity of sound)]

Q. A source is approaching towards an observer with constant speed along the line joining them. After crossing the observer, source recedes from observer with same speed. Let f is apparent frequency heard by observer. Then :

Q. Apparent frequencies of source are

n_{1}, n_{2}

when observer approaches and recedes with a velocity

50 m s^{- 1}

with respect to the stationary source. Apparent frequencies of the source are

n_{3}, n_{4}

when the same source of sound approaches and recedes with same velocity

50 m s^{- 1}

with respect to stationary observer.

If velocity of sound in air is

350 m s^{- 1}

, the increasing order of apparent frequencies is :

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