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The vibrations of 4 air columns are as s...

The vibrations of 4 air columns are as shown in the fig. the ratio of the frequencies A, B , C , D is :

A

`12 : 6 : 3 : 4 `

B

`1: 2 : 4 : 3 `

C

`4 : 2 : 3: 1`

D

`6 : 2 : 3 : 4 `

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The correct Answer is:
B
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