Question

Mention one important condition that is necessary for an echo to be heard distinctly.

• A. For echo to be heard distinctly the distance between the reflecting surface and the listener should be $17m$.
• B. For echo to be heard distinctly the distance between the reflecting surface and the listener should be $10m$.
• C. For echo to be heard distinctly the distance between the non-reflecting surface and the listener should be $17m$.
• D. For echo to be heard distinctly the distance between the non-reflecting surface and the listener should be $10m$.

Answer 1

The correct option is A For echo to be heard distinctly the distance between the reflecting surface and the listener should be $17m$.

For echo to be heard distinctly the distance between the reflecting surface and the listener should be 17 m.