An x-ray photon scatters from a free electron at rest at an angle of 120 ∘ relative to the incident direction. a) if the scattered photon has a wavelength of 0.330 nm, what is the wavelength of the incident photon? b) determine the energy of the incident photon. c) determine the energy of the scattered photon. d) find the kinetic energy of the recoil electron.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?