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Question 96
H

A boat records two echoes from one ultrasound pulse. The echo from a shoal of fish returns after 0.12 s. The echo from the seabed returns after 0.40 s.

Both echoes follow vertical paths. The speed of ultrasound is 1500 m/s.

How far above the seabed is the shoal?

[1]
A

420 m420\ \mathrm{m}420 m

B

390 m390\ \mathrm{m}390 m

C

210 m210\ \mathrm{m}210 m

D

780 m780\ \mathrm{m}780 m

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