The following unusually simple MCQ appeared in IIT-JEE 2007 question paper:
In the experiment to determine the speed of sound using resonance column,
(a) prongs of the tuning fork are kept in a vertical plane
(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 wave length 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 wave length of sound in air
As maximum possible displacement is to be imparted to the molecules of air in the resonance tube (for making the judgment of resonance condition easier), the prongs of the fork are to be kept such that they vibrate along the vertical direction (upwards and downwards). So, the correct option is (a).
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