Critical Thinking

A photon of light with a wavelength of 550.0 nm is involved in a collision with an electron. Use $6.63 \times 10^{−34} \text{m}^{2} \text{kg}/\text{s}$ for Planck’s constant. (a) How much momentum does the photon have before the collision? (b) If the wavelength of the photon leaving the collision is 650.0 nm, how much momentum does the photon have? (c) Does the momentum have to be conserved in every direction? (d) Does a longer wavelength imply more or less momentum than a shorter wavelength?