An observer starts moving with uniform acceleration a towards a stationary sound source of frequency $f_{0}$ . As the observer approaches the source, the apparent frequency f heard by the observer varies with time t as

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Solution

The correct option is A
$f = f_{0} \frac{(v + v_{0})}{v}$
$= f_{0} (\frac{v + a t}{v}) = f_{0} + (\frac{f_{0} a}{v}) t$
This is an equation of a straight line with positive intercept $f_{0}$ and positive slope
$\frac{f_{0} a}{v}$ , where v is the speed of sound in air.

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An observer starts moving with uniform acceleration a towards a stationary sound source of frequency f0. As the observer approaches the source, the apparent frequency f heard by the observer varies with time t as

The correct option is A f=f0(v+v0)v =f0(v+atv)=f0+(f0av)t This is an equation of a straight line with positive intercept f0 and positive slope f0av, where v is the speed of sound in air.

An observer starts moving with uniform acceleration a towards a stationary sound source of frequency $f_{0}$ . As the observer approaches the source, the apparent frequency f heard by the observer varies with time t as

The correct option is A
$f = f_{0} \frac{(v + v_{0})}{v}$
$= f_{0} (\frac{v + a t}{v}) = f_{0} + (\frac{f_{0} a}{v}) t$
This is an equation of a straight line with positive intercept $f_{0}$ and positive slope
$\frac{f_{0} a}{v}$ , where v is the speed of sound in air.