Question

A source of wave vibrates with a frequency $500Hz$. The wave travels $33$ m in $0.1s$. How far does the waves travels when the source executes $150$ vibrations?

• A. $11m$
• B. $99m$
• C. $66m$
• D. $128m$

Answer 1

Answer: (B)

$99m$

First,

Wavelength $=\frac{velocity}{frequency}$

Velocity $=330m/s$

Frequency $=500hz$

So wavelength $=\frac{33}{50}$

Distance travelled =velocity / frequency $\times$ no. of oscillations

Hence,

Distance travelled $=\frac{33}{50}\times 150$

$=33\times 3$

$=99m$

Hence,

option $B$ is correct answer.