With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

Step-by-step solution

Correct option is A) By using n^ =n ( v v-v_ s )2 n = n ( v - v ₀ v -0 ) v ₀=- v =-( Speed of sound ) Negative sign indicates that observer is moving opposite to the direction of velocity of sound, as shown