Question

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

• A. 4 m/s
• B. 6 m/s
• C. 9 m/s
• D. 5 m/s

Answer 1

The correct option is C 9 m/s

Given:

Number of waves = 54

Time = 1 minute = 60 second

Wavelength \left ( \lambda \right ) =10 m

To Calculate:

Wave velocity = ?

Solution:

Use formula of frequency

Frequency(f)=$\frac{\text{Number of waves}}{Time}$

Frequency(f)=$\frac{54}{60}\left(Hz\right)$

Use formula of wave speed

$\text{Wave speed}=Frequency\times Wavelength$

$\text{Wave speed}=\frac{54}{60}\times 10$

$\Rightarrow \text{Wave speed}=9\left(\frac{m}{s}\right)$

Hence, the answer is Opt : [C]