Question

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 receiver 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.

• 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 1

The correct option is C Only Statements - 1 and 2 are correct

when source and observer both are moving in the same direction with the same velocity then there will not be any change in the observed frequency by the observer, so statement 1 and 2 are correct but 3 is not correct.
option "C" is correct.