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 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 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 1

The correct option is A prongs of the tuning fork are kept in a vertical plane

In an experiment to determine the speed of sound using a resonance column , prongs of the tuning fork are kept in a vertical plane so that both the prongs can send sound waves inside the tube .

In one resonance the length of resonating air column is ,

$l_1=\lambda /4$ ,

and in another resonance the length of resonating air column is ,

$l_2=3\lambda /4$ ,

only option B is correct .