Question

Two open pipes of length 50 cm and 51 cm produce 6 beats when sounded together, find the speed of sound :

• A. $330m{s}^{-1}$
• B. $316m{s}^{-1}$
• C. $306m{s}^{-1}$
• D. $360m{s}^{-1}$

Answer 1

Answer: (C)

$306m{s}^{-1}$

$f_1-f_2=6or\frac{v}{2l_1}-\frac{v}{2l_2}=6$
$\frac{v}{2\left(0.5\right)}-\frac{v}{2\left(0.51\right)}=6orv=306m{s}^{-1}$