A steel rod 100 m long is struck at one end. A person at the other end hears two sounds as a result of two longitudinal waves. Explain this phenomenon. Find the time interval between the two sounds. Given: molecular weight of air = 28.8, room temperature = 27 ºC. Y for steel = 2 × 10 11 Pa, density of steel = 7.8 g cm –3 . (Assume air to be diatomic)
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0.2675 s
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