Question

An isotropic stationary source is emitting waves of frequency n and wind is blowing due north. An observer A is on north of the source while observer B is on south the source. If both the observers are stationary, then

• A. frequency received by A is greater than n
• B. frequency received by B is less than n
• C. frequency received by A equals to that received by B
• D. frequencies received by A and B cannot be calculated unless velocity of waves in still air and velocity of wind are known

Answer 1

The correct option is C frequency received by A equals to that received by B

Since source and both the observers are stationary, therefore no change will be observed by the two observers. It means both the observers will receive waves with natural frequency, which is equal to n.