The kinetic energy of a photon can be calculated from the product of the planck's constant and the frequency of the light. In this problem, we are given the wavelength. Frequency and wavelength are related. We do as follows:
E = hv where h is the Plank's constant and v is the frequency (v = speed of light / wavelength )
E = h (speed of light / wavelength)
E = 6.63x10^-34 ( 3x10^8 )/ (1.50x10^-7 )
E = 1.326x10^-18 J = 8.26 eV
