question_answer

A resonance tube is old and has jagged end. It is still used in the laboratory to determine velocity of sound in air. A tuning fork of frequency 512 Hz produces first resonance when the tube is filled with water to a mark 11 cm below a reference mark, near the open end of the tube. The experiment is repeated with another fork of frequency 256 Hz which produces first resonance when water reaches a mark 27 cm below the reference mark. The velocity of sound in air, obtained in the experiment, is close to-              [JEE Main 12-Jan-2019 Evening]

A)

B)

C)

D)

Correct Answer: C

Solution :

[c] Due to jagged end                      ...(i)

(ii)

From eqn. (i) and (ii)

From eqn. (i)