Question

What is the frequency of light emitted by a helium-neon laser with a wavelength of 632.8 nm? $(c=3.00x{10}^8)$

Answer 1

Given : $\lambda =632.8\times {10}^{-9}m$ and $c=3.00\times {10}^{8}m/s$
Let $f$ = the frequency
$f=\frac{c}{\lambda }$
$f=\frac{3.00\times {10}^{8}m/s}{632.8\times {10}^{-9}m}$
$f=\frac{3.00\times {10}^{8}m/s}{632.8\times {10}^{-9}m}$
$f=4.74\times {10}^{14}Hz$