An 80 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
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 3 44 m/s) Also Young's modulus
of brass=9x10^10N.m^2, density of brass = 8.6×10^3 kg/m^3.
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