Question

A person stands at a point 245 m in front of the face of a sheer cliff. 1f the person shouts, how much time will elapse before an echo is heard? (Assume the speed of sound is 344 m/s.)

Answer 1

Answer: time = 1.42 seconds

Explanation:

The formula for calculating time is expressed as

time = distance/speed

From the information given,

distance of person from cliff = 245

total distance travelled by echo in returning = 245 x 2 = 490

speed of sound = 344 m/s

Thus,

time = 490/344

time = 1.42 seconds