IIT JEE Advanced 2009 Paper 2

Section: Physics

Question : 9 of 57

Marks: +1, -0

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,

[JEE Adv 2009 P2]

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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