Question

A tuning fork having a frequency of $480Hz$ produces waves of wavelength $2.5m$, then the velocity of sound in the medium is:

• A. $\frac{6}{5}{kms}^{-1}$
• B. $1200m{s}^{-1}$
• C. $12cm{s}^{-1}$
• D. $1200mm{s}^{-1}$

Answer 1

Answer: (A), (B)

The correct options are
A $\frac{6}{5}{kms}^{-1}$
B $1200m{s}^{-1}$

We know that, velocity $\left(v\right)$ of sound $=$ frequency $\left(f\right)\times$ wavelength $\lambda$

or $v=480\times 2.5=1200m/s=\left(1200/1000\right)km/s=1.2km/s=\frac{6}{5}km/s$

Thus, both options A and B are correct.