A student performed the experiment to measure the speed of …

Physics Wave and Sound JEE (Main) / AIEEE Problems Previous Years MCQ (Single Correct)

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,

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

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

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

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

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(a, d)

The intensity of sound decreases with increases of order. The intensity of sound is maximum for first resonance.

The prongs vibrate in vertical plane.

The prongs does not vibrate in amplitude of that order.

Consider end correction, the length of air column is slightly less than λ/4

So answer are and

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