Question

Select One Correct Option from the following: An open pipe is suddenly closed at one end with the result that the frequency of the third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency (in Hz) of the open pipe is
(A) 200
(B) 300
(C) 240
(D) 480

Answer 1

d option is correct I think.
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Answer 2

Select One Correct Option from the following: An open pipe is suddenly closed at one end with the result that the frequency of the third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency (in Hz) of the open pipe is

(A) 200

(B) 300

(C) 240

✴️ (D) 480