A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
- 30 s
- 10 s
- 10 s
-
15 s
The correct answer is: D
Explanation
V = X/t
330 = ( 4.95 x 10^3)/t
t = (4.95 x 10^3/330 =
= 15 secs
There is an explanation video available .