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The vibrations of four air columns under...

The vibrations of four air columns under identical conditions are represented in the figure below. The ratio of frequencies `n_p : n_q : n_r : n_s ` will be

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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