Question

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 vibration of the ends of the prongs is typically around $1$ cm
• D. The length of the air-column at the first resonance was somewhat shorter than $1/4$th of the wavelength of the sound in air

Answer 1

Answer: (A), (D)

The correct options are
A The intensity of the sound heard at the first resonance was more than that at the second resonance
D The length of the air-column at the first resonance was somewhat shorter than $1/4$th of the wavelength of the sound in air