What is the energy of one photon of this light?

Question

In addition to continuous radiation, fluorescent lamps emit sharp lines in the visible region from a mercury discharge within the tube. Much of this light has a wavelength of 436 nm. What is the energy (in J) of one photon of this light?

Answer 1

It's Plancks Constant divided by the wavelength. Do the math. (And it probably wouldn't hurt anything if you tried reading your book, either ☺)

Doug