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 v_s is positive and v_o = 0. ∴ f' = v/v - v_s × f, i.e. f' > f (ii) If source is moving away from listener but listener is at rest, then v_s is negative and v_o = 0. ∴ f' = [v/v - (-v_s) × f = (v/v + v_s) × f i.e. f' < f (iii) If source is at rest and listener is moving away from source, then v_s = 0 and v_o is position. ∴ f' = (v - v_o/v) × f i.e. f' < f