The line spectrum of lithium has a red line at 670.8 nm. Calculate the energy of a photon with this wavelength

Question

Thats the question.
Please show calculations! :]

Answer 1

I'll let you do the calculation, but the equation you need is:

E = hc/lambda

where h is Planck's constant, c is the speed of light in m/s and lambda is the wavelength of the light (in meters). You can find the rest of the numbers in your text book, I'm sure...