1.

A curve is plotted to represenet the dependence of the ratio of the received frequency `f` to the frequency `f_0` emitted by the source on the ratio of the speed of obsever `V_(ob)` to the speed of sound `V_(sound)` in a situation in which an observer is moving towards a stationary sound source. The curve is best represnted by :A. B. C. D.

Answer» `f=f_0(1+V_(ob)/V_(sound))`
`rArr f/f_0=1+V_(ob)/V_(sound)`(straight line) , when `V_(ob)/V_(sound)=0 ,f/(f_(0))=1`
and as `V_(ob)/V_(sound)to 1 rArr f/(f_(0)) to 2`


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