JEE Advanced 2007 Physics question

In the experiment to determine the speed of sound using a resonance column,

(A)prongs of the tuning fork are kept in a vertical planeCorrect
(B)prongs of the tuning fork are kept in a horizontal plane
(C)in one of the two resonances observed, the length of the resonating air column is close to the wavelength of sound in air
(D)in one of the two resonances observed, the length of the resonating air column is close to half of the wavelength of sound in air

Answer: (A)

Solution

The vibrating fork is held over the mouth of the tube with its prongs in a vertical plane, so that the prongs move up and down along the axis of the tube and send longitudinal waves straight down the air column,

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Question ID VK-037470