1.

A pipe closed at one end open at the other end, resonates with sound waves of frequency 135 Hz and also 165 Hz, but not with any wave of frequency intermediate between these two. Then, the frequency of the fundamental note isA. 30HzB. 15HzC. 60HzD. 7.5Hz

Answer» Correct Answer - B
`n_1-n_2` = 165 - 135 = 30
The difference between two successive harmonics = 2 fundamental frequency
`30 therefore 2n therefore n = 15Hz`


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