Question

A boat is fitted with an echo-sounder, which

uses ultrasound with a frequency of 40 kHz.

Ultrasound pulses take 0.3 s to travel from the

boat to the seabed and return. How deep is

the water under the boat?

(a) 216 m (b) 21.6 m

(c) 2160 m (d) 21.6 km​

Answer 1

Answer:

21 .6 m is this is write answer is this wrong answer about the paper