Question

The fundamental frequency of a closed organ pipe of length
20 cm is equal to the second overtone of an organ pipe
open at both the ends. The length of organ pipe open at
both the ends is [2015]
(a) 100 cm (b) 120 cm
(c) 140 cm (d) 80 cm

Answer 1

Answer:

(b) 120 cm

Explanation:

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Answer 2

option b 120 cm is correct