JEE PYQ: Waves And Sound Question 36
Question 36 - 2019 (12 Apr Shift 2)
A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound ($v$) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, $l_1 = 30$ cm and $l_2 = 70$ cm. Then, $v$ is equal to :
(1) 332 ms$^{-1}$
(2) 384 ms$^{-1}$
(3) 338 ms$^{-1}$
(4) 379 ms$^{-1}$
Show Answer
Answer: (2)
Solution
$V = f\lambda = f \times 2(l_2 - l_1)$
$= 480 \times 2(0.70 - 0.30)$
$= 384$ m/s
BETA
