An 80.0 m long brass rod is struck at one end. A person at the other end hears two sounds as a result of two longitudinal waves, one travelling in the metal rod and the other travelling in the air. What is the time interval between the two sounds? The speed of sound in air is 344 m/s. (Density of brass is 8.6 × 103 kg/m3 and young’s modulus of brass is 9 × 1010 pa)
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