MP Board · Class 9 · Science · SoundA person clapped his hands near a cliff and heard the echo after $2\text{ seconds}$. What is the distance of the cliff from the person if the speed of sound is $346\text{ m/s}$?

Given Data:

• Speed of sound ($v$) = $346\text{ m/s}$
• Time taken for echo to return ($t$) = $2\text{ seconds}$

Formula:\nLet the distance between the person and the cliff be $d$.\nThe sound travels to the cliff and reflects back, so total distance traveled by sound = $2d$.

$$\text{Total Distance } (2d) = \text{Speed } (v) \times \text{Time } (t)$$ $$2d = 346 \times 2$$ $$2d = 692\text{ m}$$ $$d = \frac{692}{2} = 346\text{ m}$$

Answer:\nThe distance of the cliff from the person is $346\text{ meters}$.