Question

What will be the wave velocity, if the radar gives $54$ waves per min and wavelength of the given wave is $10m$?

• A. $4m{s}^{-1}$
• B. $6m{s}^{-1}$
• C. $9m{s}^{-1}$
• D. $5m{s}^{-1}$

Answer 1

Answer: (C)

$9m{s}^{-1}$

If the radar gives $54$ waves per minute and the wavelength$\lambda$ is $10m$, then it means that the wave travels a distance of $54\times 10$metres in one minute.

Since the SI unit of velocity(v) m/s, $v=\frac{54\times 10}{60}=$ 9m/s