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A source is approaching towards an obser...

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,

A

`f` will keep on increasing during approaching

B

`f` will keep on decreasing during receding

C

`f` will remain constant during apporaching

D

`f` will remain constant during receding

Text Solution

Verified by Experts

The correct Answer is:
C, D
During approach,
`f = f_(o) ((nu)/(nu - nu_(s)))`
`gt f_(o)` but `f` is constant.
During receding.
`f = f_(o) ((nu)/(nu - nu_(s)))`
`lt f_(o)` but `f` is again constant.
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