Find the wavelength of a photon in terms of the photon's energy . Recall that photons are described by the eq

Answer 1

Energy = Planck Constant x Frequency,
i.e. E = h f

but -:
Frequency = Speed of Light / Wavelength, therefore-:
f = c / lambda

Energy = Planck Constant x Speed of light / Wavelength
E = h c / lambda

Wavelength = Planck Constant x Speed of Light / Energy

lambda = h c / E

(Pretty easy really ;o) )