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A tuning fork of frequency 340 H(Z) is s...

A tuning fork of frequency `340 H_(Z)` is sounded above an organ pipe of length `120 cm` . Water is now slowly poured in it . The minimum height of water column required for resonance is ( speed of sound in air = `340 m//s`)

A

`25 cm`

B

`45 cm`

C

`75 cm`

D

`95 cm`

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda = (v)/(f) = (340)/(340) = 1m`
Resonance lenghts are `(lambda)/(4), (3lambda)/(4), (5lambda)/(4),…`
`=25 cm, 75 cm, 125 cm`
`125 cm` is not possible

`h = 120-75=45 cm`
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