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A sound signal sent underwater between two boats 4.5 km apart is received after 3 s. What is the speed of sound in the water?
A750 m/s
B1350 m/s
C13500 m/s
D1500 m/s
Answer & Solution
Correct answer: D. 1500 m/s
1. Convert distance: $4.5\,\text{km} = 4500\,\text{m}$.
2. Speed $= \dfrac{\text{distance}}{\text{time}} = \dfrac{4500}{3}$.
3. $v = 1500\,\text{m/s}$.
4. Trap A wrongly halves the distance (no echo here, it is one way); trap D forgets the km to m gives wrong scaling.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.78_
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