A sound source has frequency f. Source and observer both have same speed.For the apparent frequency observed by observer match the following.

An observer starts moving with unifrom acceleration a towards a stationary sound soure of frequency f_(o) . As the observer approaches the source ,the apparent frequency f heard by the observer varies with time t as

An observer starts moving with unifrom acceleration a towards a stationary sound soure of frequency f_(o) . As the observer approaches the source ,the apparent frequency f heard by the observer varies with time t as

An observer starts moving with uniform acceleration ‘a’ towards a stationary sound source emitting a whistle of frequency ‘n\ As the observer approaches source, the apparent frequency heard by the observer varies with time as

An observer starts moving with uniform acceleration a towards a stationary sound source emitting a whistle of frequency n . As the observer approaches source, the apparent frequency, head by the observer varies with time as

source and observer both start moving simultaneously from origion one along y - axis with speed of source = 2 (speed of observer ). The graph between the apparent frequency observed by observer (f) and time (t) would be

Source and observer both start moving simultaneously from origin one along X-axis an the other along y-axis with speed of source = 2 (speed of observer). The graph between the apparent frequency observed by observer (t) and time (t) would be: (Here, f0 = natural frequency of source)

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,