AP EAMCET · PHYSICS · Waves and Sound
A car is moving with a speed of \(72 \mathrm{~km} / \mathrm{h}\) towards a hill. Car blows horn at a distance of \(1800 \mathrm{~m}\) from the hill. If echo is heard after \(10 \mathrm{~s}\), the speed of sound (in \(\mathrm{m} / \mathrm{s}\) ) is
- A \(300\)
- B \(320\)
- C \(340\)
- D \(360\)
Answer & Solution
Correct Answer
(C) \(340\)
Step-by-step Solution
Detailed explanation
The speed of the car is \(72 \mathrm{~km} / \mathrm{h}\) \[ =72 \times \frac{5}{18}=20 \mathrm{~m} / \mathrm{s} \] The distance travelled by car in \(10 \mathrm{~s}\) \[ =10 \times 20=200 \mathrm{~m} \] Hence, the distance travelled by sound in reaching the hill and coming back…
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