Question

Determine the minimum distance between the listener and reflector for an echo to be heard dintinctively of a sound propagating with a speed v m/s?

Answer 1

Answer:

[tex]\boxed{\begin{minipage}{7 cm}

Fundamental Trigonometric Identities \\ \\ $\sin^2\theta + \cos^2\theta=1 \\ \\ 1+\tan^2\theta = \sec^2\theta \\ \\ 1+\cot^2\theta = \text{cosec}^2 \,\theta$\end{minipage}}[/tex]