Question

What is the frequency of blue light that has a wavelength of 463 nm?

Answer 1

The equation is:
$f=\frac{C}{\lambda }$
where f in the fequency (in Hz) C is the speed of light,$C=3.0\times {10}^8$ m/s and $\lambda$ is the wavelength (in meters).
Convert the wavelength to meters :
$463nm=463\times {10}^{-9}m$
$f=\frac{3.0\times {10}^{8}m/s}{463\times {10}^{-9}m}$
$f=6.48\times {10}^{14}Hz$