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 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

A source of sound and an observer are approaching each other with the same speed which is equal to (1)/(10) times the speed of sound. The apparent change in the frequency of the source is

A source of sound of frequency 300 Hz and a receiver are located along the same line normal to the wall as shown in the figure. Both the source and the receiver are stationary and the wall receeds from the source with velocity 20ms^-1 .If the beat frequency registered by the receiver is 240/x Hz then x is : (Assume V_("sound")=300 m/s).

A source of sonic oscillations with frequency n=1700Hz and a receiver are located on the same normal to a wall. Both the source and receiver are stationary, and the wall recedes from the source with velocity u=6.0(m)/(s) . Find the beat frequency registered by the receiver. The velocity of sound is v=340(m)/(s) .

A source of frequency n and an observer are moving on a straight line with velocities a and b respectively. If the source is ahead of the observer and if the medium is also moving in the direction of their motion with velocity c, (the velocity of sound being V), then the apparent frequency of the sound heard by the observer would be -

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