JEE Advanced · Physics · 16. Waves & Sound
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 place above the resonance tube
- C the amplitude of vibration of the ends of the prongs is typically around \(1 \mathrm{~cm}\)
- 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 & Solution
Correct Answer
(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
Step-by-step Solution
Detailed explanation
\(1 < \frac{\lambda}{4}\)
Further, larger the length of air column, feebler is the intensity.
Further, larger the length of air column, feebler is the intensity.
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