Question

Wavelength of light of frequency $100Hz$ is :

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

Answer 1

Answer: (C)

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 $3\times 10^{6}m$