Photoelectric factors affecting

1. Photoelectric Effect Factors

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 metal’s cut-off frequency, or higher, shines on that metal.

6. - - - - - - - - - - - - - - - - f

7. f - - - - - - - - - - - - - - - -

8. f - - - - - - - - - - - - - - - -

9. f - - - - - - - - - - - - - - - -

10. f - - - - - - - - photoelectric emission photoelectric emission - - - - - - - -

11. Zn’s cut-off wavelength

13. f if = 288 nm (288 x 10 -9 m)   f = 1,04 x 10 15 s -1  

14. Zn’s f o and o   1,04 x 10 15 Hz

15. LIGHT intensity colour has photoelectric emission determined by light’s frequency determined by emission rate PHOTONS consists of energy carry amount of determined by metal determines if o ccurs from a of affects rate that

16. LIGHT colour has photoelectric emission determined by light’s frequency PHOTONS consists of energy carry amount of determined by determines if o ccurs from a =f <f >f if if t ype determines f W W 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 > f

19. Effect of intensity on emission: f < f

20. 2. If the light’s frequency is below the metal’s cut-off frequency, photoelectric emission does not occur, regardless of the light’s intensity.

21. 2. If the light’s frequency is above the metal’s cut-off frequency, photoelectric emission does occur , regardless of the light’s 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 (nm) f (Hz) Movie Pt 196 1,53 x 10 15 Cu 263 1,14 x 10 15 Zn 289 1,04 x 10 15 Ca 427 7,03 x 10 14 Na 539 5,57 x 10 14 Metal f (Hz) Movie Pt 196 1,53 x 10 15 Cu 263 1,14 x 10 15 Zn 289 1,04 x 10 15 Ca 427 7,03 x 10 14 Na 539 5,57 x 10 14

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 > f

30. 4. Increasing light intensity increases the rate at which electrons are emitted from a metal when photoelectric emission does occur.

31. 5. How does the frequency of light affect the kinetic energy of the emitted electrons during photoelectric emission?

32. Effect of frequency on KE of emitted electrons

33. 4. Increasing the frequency of light, from the cut-off frequency, increases the kinetic energy of the electrons emitted during photoelectric emission.

34. energy photon gives energy e - needs to break free e - ‘s kinetic energy

35. LIGHT intensity colour has determined by light’s frequency determined by light’s amplitude photoelectric emission metal o ccurs from a determines if

36. LIGHT intensity colour has photoelectric emission determined by light’s frequency determined by emission rate PHOTONS consists of energy carry amount of determined by metal determines if o ccurs from a of affects rate of