Question

A sound source emits sound waves of frequency 500 Hz and wavelength 0.2 m. How does it take the waves to travel 300 m.

• A. 75 s
• B. 60 s
• C. 12 s
• D. 3 s

Answer 1

The correct option is D

3 s

Step 1: Given,

Frequency (f) = 500 Hz,

Wavelength $\left(\lambda \right)$=0.2 m,

Total length traveled by wave = 300 m,

Step 2: We know that,

Speed of wave $\left(v\right)=f\times \lambda$

$$\begin{gathered} v=500Hz\times 0.2m \\ v=100m/sec \end{gathered}$$

Step 3: Using the formula of speed,

$v=\frac{dis\tan ce}{time}$

$$\begin{gathered} Time=\frac{Dis\tan ce}{speed} \\ t=\frac{300m}{100m/sec} \\ t=3sec \end{gathered}$$

Hence, the correct option will be D.