Question

Wavelength of the light frequency $100Hz$ is _________.

• A. $2\times {10}^{6}m$
• B. $4\times {10}^{6}m$
• C. $3\times {10}^{6}m$
• D. $5\times {10}^{6}m$

Answer 1

The correct option is C $3\times {10}^{6}m$

Given that the light frequency is $100Hz$

We know that the speed of the light is $3\times {10}^{8}m/s$

We have the equation,

$V=n\lambda$

where,

$V$ is the Wave velocity

$n$ is the Frequency

$\lambda$ is the Wavelength

$⟹$ $\lambda =\frac{V}{n}$

That is,

$\lambda =\frac{3\times {10}^8}{100}=3\times {10}^{6}m$

Hence the wavelength is $3\times {10}^{6}m$