# The equation of a progressive wave is given by, $y= 5 \sin p (\frac{t}{0.02}- \frac{x}{20})$  m, then the frequency of the wave is Option 1) 100 Hz Option 2) 50 Hz Option 3) 25 Hz Option 4) 10 Hz

As we learnt in

Travelling Wave Equation -

$y=A \sin \left ( Kx-\omega t \right )$

- wherein

$K=2\pi /\lambda$

$\omega = \frac{2\pi }{T}$

$\lambda =$  wave length

$T =$ Time period of oscillation

$y=5sin\pi\:.\:(\frac{t}{0.02}-\frac{x}{20})$             [p should be $\pi$]

$\omega=\frac{\pi}{0.02}=>f=\frac{\omega}{2\pi}=\frac{1}{0.04}=25\:Hz$

Option 1)

100 Hz

This option is incorrect.

Option 2)

50 Hz

This option is incorrect.

Option 3)

25 Hz

This option is correct.

Option 4)

10 Hz

This option is incorrect.

### Preparation Products

##### Knockout BITSAT 2020

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 1999/-
##### Knockout BITSAT 2021

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 2999/-
##### Knockout BITSAT-JEE Main 2021

An exhaustive E-learning program for the complete preparation of JEE Main and Bitsat.

₹ 27999/- ₹ 16999/-