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A source of frequency f is moving toward...

A source of frequency `f` is moving towards the observer along the line `SO` with a constant velocity `upsilon_(s)` as shown in figure. Plot `f'` versus `t` graph . Where `f'` is the changed frequency observed by the observer.

Text Solution

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`f' = f ((upsilon)/( upsilon - upsilon_(s)))= f_(1)` (say)
`f' gt f`
but `f'` is constant with time.
`f' = f ((upsilon)/( upsilon - upsilon_(s)))= f_(2)` (say)
`f'lt f`
but `f'` is constant with time . The correct `f'` versus `t` graph is as shows.
In the figure, `t_(0)` is the time when source is crossing the observer.
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Knowledge Check

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