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 int

Question

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 int

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 is
A. 30 Hz
B. 15 Hz
C. 60 Hz
D. 7.5 Hz

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - b
In a closed pipe, resonance frequency,
`v= (2r-1)//4l=135 and 165.`
The lowest frequency must be highest common factor of
135 and 165, which is 15 Hz.

5 views Answered 2023-02-05 15:29