An observer starts moving with uniform acceleration, 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 ) is

Question

An observer starts moving with uniform acceleration, 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 ) is (A) Option 1

(B)

(C)

(D)

Tardigrade Admin · Accepted Answer

Let v be the speed of sound in air, vL velocity of observer at time t. As the observer approaches the source, therefore, apparent frequency f=((. v + vL .)/v)f0=[(v + (. 0 + a t .)/v)]f0=f0+((f0 a t/v)) This is the equation of a straight line with a positive intercept (f0) and positive slope ((f0 a/v)) .

Q. An observer starts moving with uniform acceleration, 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 ) is

Q. An observer starts moving with uniform acceleration, 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 ( $t$ ) is