Photoelectric factors affecting
Download as PPTX, PDF
0 likes1,053 views
The document discusses factors that affect photoelectric emission from metals. 1) Photoelectric emission only occurs when light has a frequency above the metal's cutoff frequency. The type of metal determines the cutoff frequency. 2) Light intensity does not affect whether emission occurs, only the frequency relative to the cutoff matters. 3) Increasing light intensity increases the rate of electron emission for frequencies above the cutoff.
Photoelectric factors affecting
- 2. WHETHER EMISSION OCCURS Photoelectric Effect: Factors affecting
- 3. 1. How does the frequency of light affect whether photoelectric emission occurs?
- 4. Effect of f on emission
- 5. 1. Photoelectric emission only occurs when light of a metals cut-off frequency, or higher, shines on that metal.
- 6. - - - - - - - - - - - - - - - -
- 7. - - - - - - - - - - - - - - - -
- 8. - - - - - - -- - - - -----
- 9. - - - - - - - - - - - - - - - -
- 10. - - - - - - - - photoelectric emission photoelectric emission - - -- -- - -
- 13. f if = 288 nm (288 x 10-9m) = = 3 108 1 288 109 f = 1,04 x 1015 s-1
- 14. Zns fo and o 1,04 x 1015 Hz
- 15. LIGHT intensity colour has photoelectric emission determined by lights frequency determined by emission rate PHOTONSconsists of energy carry amount of determined by metal determines if occurs from a of affects rate that
- 16. LIGHT colour has photoelectric emission determined by lights frequency PHOTONSconsists of energy carry amount of determined by determines if occurs from a =f0<f0 >f0 if if type determines f0W0 W0 if each e- receives energy has has > is an amount of metal
- 17. 2. How does the intensity of light affect whether photoelectric emission occurs?
- 18. Effect of intensity on emission: f > f0
- 19. Effect of intensity on emission: f < f0
- 20. 2. If the lights frequency is below the metals cut-off frequency, photoelectric emission does not occur, regardless of the lights intensity.
- 21. 2. If the lights frequency is above the metals cut-off frequency, photoelectric emission does occur, regardless of the lights intensity.
- 22. 2. Light intensity does not affect whether or not photoelectric emission occurs.
- 23. 3. Does the type of metal affect whether photoelectric emission occurs at a particular frequency?
- 24. Effect of metal on emission
- 25. Metal 0 (nm) f0 (Hz) Movie Pt 196 1,53 x 1015 Cu 263 1,14 x 1015 Zn 289 1,04 x 1015 Ca 427 7,03 x 1014 Na 539 5,57 x 1014
- 26. 3. The type of metal does affect whether photoelectric emission occurs at a particular frequency.
- 27. RATE OF EMISSION Photoelectric Effect: Factors affecting
- 28. 4. How does the intensity of light affect the rate at which electrons are emitted during photoelectric emission?
- 29. Effect of intensity on rate of emission: f > f0
- 30. 4. Increasing light intensity increases the rate at which electrons are emitted from a metal when photoelectric emission does occur.
- 34. 5. How does the frequency of light affect the kinetic energy of the emitted electrons during photoelectric emission?
- 35. Effect of frequency on KE of emitted electrons
- 36. 4. Increasing the frequency of light, from the cut-off frequency, increases the kinetic energy of the electrons emitted during photoelectric emission.
- 37. energy photon gives energy e- needs to break free e- s kinetic energy
- 38. LIGHT intensity colour has determined by lights frequency determined by lights amplitude photoelectric emissionmetal occurs from a determines if
- 39. LIGHT intensity colour has photoelectric emission determined by lights frequency determined by emission rate PHOTONSconsists of energy carry amount of determined by metal determines if occurs from a of affects rate of