Question

estion 7
a) i) What is the principle on which sonar is based?
ii) Calculate the minimum distance at which a person should stand in front of a reflecting
surface so that he can hear a distance echo. (Speed of sound in air = 350m/s). [31
erson trying to do to
is the​

Answer 1

Answer:

1) Sonar works on the principle of echoes. A strong and short (ultrasonic) sound signal is sent towards the bottom of the ocean. The echo of this signal is then detected by it.

2)

The sensation of sound persists in our brain for about 0.1 s.

i.e to hear a distinct echo the minimum time interval between the original sound and the reflected sound = 0.1s.

Distance = v×t / 2

               = 350 m/s × 0.1s / 2

               = 35 m / 2

               = 17.5 m