I am creating a summary for AS physics however, there is something Im not sure on.
I know that when a photon collides/ is absorbed by and electron it must have the exact energy that is required for it to move up any energy level but why is this? and what happens if the photon doesnt have enough energy to excite the electron up a distinct energy level?
energy levels in atoms question Watch
- Thread Starter
Last edited by Ladkus; 03-10-2017 at 21:42.
- 03-10-2017 21:37
- 03-10-2017 22:06
I think this is correct: if it doesn’t have the exact energy to move up an energy level, then simply nothing will happen.
- 05-10-2017 05:27
In scattering, photons induce electric dipoles; then emitted as dipole radiation in some direction. With small atoms, Rayleigh scattering occurs (elastic); scattering intensity ∝ (1 + cos^[email protected])/(x^2 λ^4).
Larger particles (smoke, droplets) can Mie scatter, λs scatter equally. Rayleigh is why the sky is blue, sunsets are red and Mars is opposite. Mie is why clouds and horizon's daytime sky are white.
Photons ejecting electrons from atoms, or collide with free electrons; compton scattered (inelastic). Photons where only some energy is used to excite, scatter at lesser E & f; Raman scattered (inelastic).Last edited by Physics Enemy; 05-10-2017 at 05:55.