1.

A string of length 2m is fixed at two ends. it is in resonance with a tuning fork of frequency 240Hz in its third harmonic. Then speed of wave sound in string and its fundamental frequency is:(1) 240m/s, 80Hz(2) 320m/s, 80Hz(3) 640m/s, 80Hz(4) 120m/s, 40Hz

Answer»

The correct option (2) 320m/s, 80Hz   

Explanation:

f3 = 3V/2L = 240

(3 x V)/(2 x 2) = 240

V = 320m/s

 f0 = V/2L = 320/(2 x 2) = 80Hz



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