Helium-neon laser is usually constructed to operate in the red light which has the wavelength of 632.8 nm. 1) Calculate the expected frequency of

Helium-neon laser is usually constructed to operate in the red light which has the wavelength of 632.8 nm. 

1) Calculate the expected frequency of this red laser light in Gigahertz?

2) What is the energy of a single photon generated from this laser (in eV)?

          Note: 1 eV = 1.602x10-19 J.