Question

Wavelength of light of frequency $100 \,Hz$ 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 $100\,Hz$
We know that the speed of the light is $3 \times 10^8\, m/s$
We have the equation,
$V=nλ$
where,
$V$ is the Wave velocity
$n$ is the Frequency
$λ$ is the Wavelength
$\Longrightarrow \lambda=\frac{ V }{ n }$
That is,
$\lambda=\frac{3 \times 10^{8}}{100}=3 \times 10^{6} m$
Hence the wavelength is $3 \times 10^{6} m$