A source `S` of sound wave of fixed frequency `N` and an observer `O` are located in air initially at the space points `A` and `B`, a fixed distance apart. State in which of the following cases, the observer will NOT see any Doppler effect and will receive the same frequency `N` as produced by the source.

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4ms^-1 at an angle of 60^(@) with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330ms^-1 ) is

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4ms^-1 at an angle of 60^(@) with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330ms^-1 ) is

A source od sound S emitting waves of frequency 100 Hz and an observer o are located at some distance from each other. The source is moving with a speed of 19.4 ms^-1 at an angle of 60^@ with the source observe line as shwon in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330 ms^-1 is:

A wave source of frequency v and an observer are located a fixed distance apart. Both the source and observer are stationary. However, the propagation medium (through which the waves travel at speed v) is moving at a uniform velocity v_(m) in an arbitrary direction. If v' is the frequency received by the observer then :

A source of sound and an observer, both are moving with the same speed, in the same direction. Will there be any Doppler effect observed by the observer ?

A source of sonic oscillations of frequency n_(0) = 2000 Hz and a receiver are located on the same normal to a wall. Both the source and the receiver are stationary and the wall recedes from the source with a velocity u = 10 cm//s . Find the beat frequency registered by the receiver. The velocity of sound is v = 340 m//s

The graph between distance between source and observer and apparent frequency in the case of Doppler's effect will be