Question

What is Different situation in Apparent Frequency?

Answer

Different situation in Apparent Frequency - (i) If source is moving towards listener but listener is at rest, then vs is positive and vo = 0. ∴ f' = v/v - vs × f, i.e. f' > f (ii) If source is moving away from listener but listener is at rest, then vs is negative and vo = 0. ∴ f' = [v/v - (-vs) × f = (v/v + vs) × f i.e. f' < f (iii) If source is at rest and listener is moving away from source, then vs = 0 and vo is position. ∴ f' = (v - vo/v) × f i.e. f' < f