MHT CET 2025 Physics question

In an open end organ pipe of length 'L', if the velocity of sound is 'V', then the fundamental frequency will be (Neglect end correction)

(A) and all harmonics are present.Correct
(B) and all harmonics are present.
(C) and even harmonics are present.
(D) and even harmonics are present.

Answer: (A)

Solution

An open organ pipe has an antinode at both ends, so the fundamental mode fits half a wavelength in the pipe: , giving . The allowed frequencies are with , i.e. both odd and

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Question ID VK-102635