Question

Two sounds of equal amplitudes and frequencies, n₁ and n₂, reach a point together. The resultant wave can have which of the following forms (symbols have their usual meanings)?

(a) y = A sin [(n₁ - n₂/2)t] sin [n₁ + n₂/2)t]

(b) y = A Cos [(n₁ - n₂/2)t] cos [n₁ + n₂/2)t]

(c) y = A sin [(n₁ - n₂)t] cos [(n₁ + n₂)t]

(d) y = A sin [(n₁ - n₂)t sin [( n₁ + n₂/2)t]

Answer 1

Correct Answer is: (a) y = A sin [(n₁ - n₂/2)t] sin [n₁ + n₂/2)t], (b) y = A Cos [(n₁ - n₂/2)t] cos [n₁ + n₂/2)t]