The drawing shoes a ship $800\ m$ from a cliff. A gun is fired on the ship. After $5$ seconds the people at the front of the ship hear the sound of the gun again.
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- The name of this effect is echo.
- Sound gets reflected back after reflecting from the cliff.
- Distance covered by sound wave in $5s$ can be calculated as follws:
Sound after reflection travels $(d_R) = 800m$
Total distance travelled by sound
$= d_I + d_R$
$= (800 + 800)m$
$= 1600m$
- We have to calculate the speed of sound.
Time taken to listen to the echo$ t = 5s$
So time taken to reach the cliff $(\text{t}_\text{I})=\frac{5}{2}\text{s}$
So, the speed of sound is
$=\frac{\text{d}}{\text{t}_\text{I}}$
$=\frac{800\times2}{5}\text{m/s}$
$=320\text{m/s}$
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