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A student performed the experiment to me...

A student performed the experiment to measure the speed of sound in air using resonance air-column method. Two resonances in the air-column were obtained by lowering the water level. The resonance with the shorter air-column is the first resonance and that with the longer air-column is the second resonance. Then,

A

the intensity of the sound heard at the first resonance was more than that at the second resonance

B

the prongs of the tuning fork were kept in a horizontal plane above the resonance tube

C

the amplitude of the vibration of the ends of the prongs is typically around 1 cm

D

the length of air-column at the first resonance was somewhat shorter than `1//4`th of the wavelength of the sound in air

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