Question

State the expression for apparent frequency when listener is stationary and source is moving away from the listener.

Answer 1

Let, n = actual frequency of the source.

n₀ = apparent frequency of the source.

v = velocity of sound in air.

v_s = velocity of the source.

v₁ = velocity of the listener.

If source is receding away from observer then apparent frequency is given by,

n = `"n"_0("v"/("v" + "v"_"s"))`, i.e., apparent frequency decreases..