Question

21. A steel rod 150 cm long is clamped at its

mid point. The frequency of 1st overtone

of the rod is given to 200 Hz . What is the

speed of sound in steel ?
(A)400
B)300
(C)200
(D)600

Answer 1

Answer:

B)  300

Explanation:

wavelength = 150 cm = 1.5 m

frequency   = 200 hertz

time period = 1/frequency

                   = 1/200

                   = 0.005 sec

1. speed  = wavelength(in metre) * frequency

OR

2. speed = wavelength(in metre) / time period

using 1. st formulae

speed  = 1.5*200 = 300

using 2.nd formulae

speed  = 1.5/0.005

            = 1.5*200/1

            = 300

therefore the speed  of sound in steel = 300 m/sec

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