Question

What is the frequency of the photons emitted by a He-Ne laser with a wavelength of 632.8 nm?

Answer 1

From the wave equation: `c= lambdaf`
`=> f = c/(lambda)`
where `c =` speed of light in vacuo
`lambda =` wavelength
`f =`frequency

`=> f = 3.0*10^8/(632.8*10^-9) Hz`
`=> f= 4.7*10^(14)`