First slide

Standing waves

Question

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260Hz. What is the fundamental frequency of the system?

Moderate

A

20 Hz
B

30 Hz
C

40 Hz
D

10 Hz

Solution

Nearest harmonics of an organ pipe closed at one end is differ by twice of its fundamental frequency.
$∴ 260 - 220 = 2 v, v = 20 Hz$

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