Help exam tomorrow!Watch
Here's the energy level diagram provided:
Please could someone help. I got my AS exam tomorrow!!
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You're probably aware that an electron can only inhabit a discrete energy level. In the first part, since the collision is inelastic so kinetic energy is not conserved, it may transfer one of the discrete amounts of energy to the electron required to move it up to B or C; leaving the colliding electron with the difference between it's initial kinetic energy and the energy it took to move the ground electron up to B or C. It can't make the electron move up to D because the incoming electron simply doesn't have enough energy. Similarly, for the photon question, since it's energy doesn't match that of any of the energy levels, the electron will be unable to absorb it so nothing happens.