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A 160 cm long string has two adjacent resonances at frequencies of 85 Hz and 102 Hz. The speed of waves in the string is

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A 160 cm long string has two adjacent resonances at frequencies of 85 Hz and 102 Hz. The speed of waves in the string is

(A) 27.2 m/s (B) 54.4 m/s (C) 170 m/s (D) 5.44 m/s 

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Correct option  (B) 54.4 m/s

Explanation: 

L = 1.6 m

fundamental frequency  f1 = v/2L

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