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# The sound from a source travelled to the bottom of the sea and the echo was hear...

### Question

The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms-1 the depth of the sea is

A) 6000m

B) 3000m

C) 1500m

D) 375m

### Explanation:

t = 4s ; v = 150ms-1

depth = X ; but 2X = vt

X = $$\frac {vt}{2}$$ = $$\frac {1500 \times 4}{2}$$

X = 3000m

## Dicussion (1)

• t = 4s ; v = 150ms-1

depth = X ; but 2X = vt

X = $$\frac {vt}{2}$$ = $$\frac {1500 \times 4}{2}$$

X = 3000m