A sound source S is moving along a straight track with speed v, and is emitting sound of frequency `v_0` (see figure). An observer is standing at a finite distance at the point O, from the track . The time variation of frequency heard by the observer is best respresent by :
(`t_0` represents the instant when the distance between the source and observer is minimum )

A source emitting sound of frequency 1000 Hz is moving towards an observer at speed v_s = 0.90 v , (where v is the velocity of sound). What frequency III will be heard by the observer ?

Two identical source moving parallel to each other at seperation 'd' are producing sounds of frequency 'f' and are moving with constant velocity v_(0) . A stationary .observer 'O' is on the line of motion of one of the sources. Then the variation of beat frequency heard by O with time is best represented by: (as they come from large distance and go to a large distance)

A source emitting a sound of frequency v is placed at a large distance from an observer. The source starts moving towards the observer with a uniform acceleration a. Find the frequency heard by the observer corresponding to the wave emitted just after the source starts. The speed of sound in the medium is v.

A source emitting a sound of frequency v is placed at a large distance from an observer. The source starts moving towards the observer with a uniform acceleration a. Find the frequency heard by the observer corresponding to the wave emitted just after the source starts. The speed of sound in the medium is v.

The source of sound generating a frequency of 3 kH z reaches an observer with a speed of 0.5 times the velocity of sound in air. The frequency heard by the observer is