Question

A source of frequency of 500 Hz emits waves of wavelength 0.4 m. How long does it take the waves to travel 600 m?

विकल्प

• 3 s

• 6 s

• 9 s

• 12 s

Answer 1

3 s

Explanation:

Given: \[ f=500\ \text{Hz}\]

\[\lambda=0.4\ \text{m} \]

Speed of the wave:

\[ v=f\lambda \]

\[= 500\times0.4\]

\[= 200\ \text{m s}^{-1} \]

Time taken to travel \(600\) m:

\[ t=\frac{d}{v} \]

\[= \frac{600}{200}\]

= 3 s