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Pascal's Law

In a resonati...

Question

In a resonating air column, the second resonating length is 60 cm. The first resonance occurs when the length of the air column is:

A

30 cm

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B

10 cm

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C

20 cm

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D

60 cm

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Solution

The correct option is C 20 cm
The second resonating wavelength is $l_{2} = 3 λ / 4 = 60 c m$ .
So. $λ = 80 c m$ .
Now the first resonance length is :
$l_{1} = λ / 4 = 20 c m$

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