Statement-1: Due to the motion of listener, the frequency of the sound waves (as received by listener) emitted by stationary source is affected
Statement-2: Due to the motion of source, wavelength of the sound waves (emitted by source) as received by stationary listener is affected.
Statement-3: If recever and source both are moving, the observed frequency must be different from the original frequency of source. Treat motion of source or listener as always along a line joining them for all above cases.

Options

A. All the three statements are correct
B. Only all three statements are wrong
C. Only Statements-1 and 2 are correct
D. Only Statements -2 and 3 are correct

Answer

C

Explanation

`f=((VpmV_(0))/(VpmV_(s)))f`
`f=((VpmV_(0))/V)f`
`f=((V)/(VpmV_(s)))S`
`lambda=((VpmV_(s))/f)`
V=velocity of listener,V=Velocity of source.
But if `vec(V)_(s)=vec(V)_(0)` then f=f
Thus statement-3 is not always correct