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In the experiment to determine the speed...

In the experiment to determine the speed of sound using a resonance column -

A

prongs of the tuning fork are kept in a vertical plane

B

prongs of the tuning fork are kept in a horizontal plane

C

In one of the two resonance observed, the length of the resonating air column is close to the wavelength of sound in air

D

In one of the two resonance obsvered, the length of the resonating air column is close to half of the wavelength of sound in air.

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A
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