1 / 11

Quantum Physics

Quantum Physics. A whole new particle game. BlackBody Radiation. ALL objects radiate thermal energy Cold in the IR range – not visible Turn up the heat & radiation becomes visible ROYGBIV Big l to Short l or Low f to high f. BlackBody Exp. Black Body Problem.

verda
Télécharger la présentation

Quantum Physics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Quantum Physics A whole new particle game

  2. BlackBody Radiation • ALL objects radiate thermal energy • Cold in the IR range – not visible • Turn up the heat & radiation becomes visible • ROYGBIV • Big l to Short l or • Low f to high f

  3. BlackBody Exp.

  4. Black Body Problem • ALL OF PHYSICS predicted: T  lmax  • We get :

  5. Planck’s Luck • Mostly Bad. 1900-1944: • Wanted to solve entropy. DID IT! • Went to publish. Found J Gibbs beat him to it. Published in the RAKE. • Wife passed away. • Daughter 1 died in childbirth. • Daughter 2 took care of baby, married husband 1. Daughter 2 died in childbirth. • Son sentenced to death cuz opposed Nazi Germany.

  6. Planck-Thermodynamics • Says we get the l’s we get cuz ‘atomic oscillators’ are only able to oscillate as: E=nhf • The oscillators produce the em wave. • Planck didn’t like atoms, Boltzman. • Planck had to use atoms & Boltzman methods. • Planck didn’t like sol’n. • Useful, but maybe not accurate.

  7. Photoelectric Effect

  8. Photoelectric Effect Problem • Any f should remove electrons . Not Observed. • Intensity   Energy Regardless of f • Emitted e- energy should depend on Intensity of light beam. Not Observed. • Emitted e- NRG depends on f. Weird • Waves of light spread NRG across metal. Requires time for e- to absorb NRG & fly off. Not Observed.

  9. Light & Einstein Light is a PARTICLE • Einstein: light has no mass, but DOES have KE • Einstein predicted light waves have p! • Had no way of confirming these formulas

  10. Ephoton=hf KEmax=KEelectronf=work function KEmax=hf-f

  11. Photoelectric Effect Graph • y=mx+b • Threshold Frequency = x-intercept • Work Function = y-intercept • Planck’s Constant = slope

More Related