What other harmonics of the string, if any, are in resonance with standing waves in the air column?

9 t h

harmonic of string with

6 t h

harmonic of air column

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9 t h

harmonic of string with

3 r d

harmonic of air column

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9 t h

harmonic of string with

2 n d

harmonic of air column

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None

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Solution

The correct option is B $9 t h$ harmonic of string with $3 r d$ harmonic of air column
In closed type pipe only odd harmonics $f_{0}, 3 f_{0}, 5 f_{0}, . . .$ occur.
$∴$ $3 r d$ harmonic of air column will be in resonance with $9 t h$ harmonic of string.

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