Question

A worker lives at a distance of 1.32 km from the factory. If the speed of sound air be $330m{s}^{-1}$, how much time will the sound of factory siren take to reach the worker?

• A. 2s
• B. 3s
• C. 4s
• D. 5s

Answer 1

The correct option is C 4s

Here we use Distance formula i.e., $d=vt$ , where $d$ is the distance, $v$ is the speed and $t$ is the time.

Now Given; $v=330m/s$ and $d=1.32km\cong 1320m$ and we have to find $t$ and that is, $t=d/v$

$⟹$ $t=d/v=1320/330=4s$

$⟹$ Time taken by the sound to reach the worker is, $4second\cong 4s$

Hence, option C is correct.