Photoelectric Effect
Factors
WHETHER EMISSION OCCURS
Photoelectric Effect: Factors affecting
1. How does the frequency
of light affect whether
photoelectric emission
occurs?
Effect of f on emission
1. Photoelectric emission
only occurs when light of a
metal’s cut-off frequency, or
higher, shines on that metal.
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - -
- - - -- - - -
-----
- - -
- - - - - - - -
- - - - -
- - - - - - - -
photoelectric emission
photoelectric emission
- - -- -- - -
Zn’s cut-off wavelength
1,04 x 1015 Hz
LIGHT
intensity
colour
has
photoelectric emission
determined
by light’s
frequency
determined by
emission rate
PHOTONSconsi...
LIGHT
colour
has
photoelectric emission
determined
by light’s
frequency
PHOTONSconsists
of
energy
carry amount of
determin...
2. How does the intensity of
light affect whether
photoelectric emission
occurs?
Effect of intensity on emission: f > f0
Effect of intensity on emission: f < f0
2. If the light’s frequency is
below the metal’s cut-off
frequency, photoelectric
emission does not occur,
regardless of t...
2. If the light’s frequency is
above the metal’s cut-off
frequency, photoelectric
emission does occur,
regardless of the l...
2. Light intensity does not
affect whether or not
photoelectric emission
occurs.
3. Does the type of metal
affect whether photoelectric
emission occurs at a
particular frequency?
Effect of metal on emission
Metal 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
3. The type of metal does
affect whether photoelectric
emission occurs at a
particular frequency.
RATE OF EMISSION
Photoelectric Effect: Factors affecting
4. How does the intensity of
light affect the rate at which
electrons are emitted during
photoelectric emission?
Effect of intensity on rate of emission: f > f0
4. Increasing light intensity
increases the rate at which
electrons are emitted from a
metal when photoelectric
emission d...
5. How does the frequency
of light affect the kinetic
energy of the emitted
electrons during
photoelectric emission?
Effect of frequency on KE of emitted
electrons
4. Increasing the frequency of
light, from the cut-off
frequency, increases the
kinetic energy of the electrons
emitted du...
energy photon gives
energy e-
needs to
break free
e- ‘s
kinetic
energy
LIGHT
intensity colour
has
determined by light’s
frequency
determined by light’s
amplitude
photoelectric emissionmetal
occ...
LIGHT
intensity colour
has
photoelectric emission
determined by light’s
frequency
determined by
emission rate
PHOTONSconsi...
Photoelectric factors affecting_web
Photoelectric factors affecting_web
Photoelectric factors affecting_web
Photoelectric factors affecting_web
Photoelectric factors affecting_web
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Photoelectric factors affecting_web

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Factors affecting the occurrence and rate of photoelectric emission

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  • Light and its nature have caused a lot of ink to flow during these last decades. Its dual behavior is partly explained by (1)Double-slit experiment of Thomas Young - who represents the photon’s motion as a wave - and also by (2)the Photoelectric effect in which the photon is considered as a particle. A Revolution: SALEH THEORY solves this ambiguity and this difficulty presenting a three-dimensional trajectory for the photon's motion and a new formula to calculate its energy. More information on https://youtu.be/mLtpARXuMbM
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  • Bright white light: http://farm4.staticflickr.com/3056/2527472026_c68c99caf4_o.jpgUV bulb: http://upload.wikimedia.org/wikipedia/commons/9/96/Ultraviolet_light_bulb_2.jpg
  • Bright white light: http://farm4.staticflickr.com/3056/2527472026_c68c99caf4_o.jpgUV bulb: http://upload.wikimedia.org/wikipedia/commons/9/96/Ultraviolet_light_bulb_2.jpg
  • Bright white light: http://farm4.staticflickr.com/3056/2527472026_c68c99caf4_o.jpgUV bulb: http://upload.wikimedia.org/wikipedia/commons/9/96/Ultraviolet_light_bulb_2.jpg
  • Bright white light: http://farm4.staticflickr.com/3056/2527472026_c68c99caf4_o.jpgUV bulb: http://upload.wikimedia.org/wikipedia/commons/9/96/Ultraviolet_light_bulb_2.jpg
  • Bright white light: http://farm4.staticflickr.com/3056/2527472026_c68c99caf4_o.jpgUV bulb: http://upload.wikimedia.org/wikipedia/commons/9/96/Ultraviolet_light_bulb_2.jpg
  • Photoelectric factors affecting_web

    1. 1. Photoelectric Effect Factors
    2. 2. WHETHER EMISSION OCCURS Photoelectric Effect: Factors affecting
    3. 3. 1. How does the frequency of light affect whether photoelectric emission occurs?
    4. 4. Effect of f on emission
    5. 5. 1. Photoelectric emission only occurs when light of a metal’s cut-off frequency, or higher, shines on that metal.
    6. 6. - - - - - - - - - - - - - - - -
    7. 7. - - - - - - - - - - - - - - - -
    8. 8. - - - - - - -- - - - -----
    9. 9. - - - - - - - - - - - - - - - -
    10. 10. - - - - - - - - photoelectric emission photoelectric emission - - -- -- - -
    11. 11. Zn’s cut-off wavelength
    12. 12. 1,04 x 1015 Hz
    13. 13. LIGHT intensity colour has photoelectric emission determined by light’s frequency determined by emission rate PHOTONSconsists of energy carry amount of determined by metal determines if occurs from a of affects rate that
    14. 14. LIGHT colour has photoelectric emission determined by light’s frequency PHOTONSconsists of energy carry amount of determined by determines if occurs from a =f0<f0 >f0 if if type determines f0W0 W0 has has > is an amount of metal
    15. 15. 2. How does the intensity of light affect whether photoelectric emission occurs?
    16. 16. Effect of intensity on emission: f > f0
    17. 17. Effect of intensity on emission: f < f0
    18. 18. 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.
    19. 19. 2. If the light’s frequency is above the metal’s cut-off frequency, photoelectric emission does occur, regardless of the light’s intensity.
    20. 20. 2. Light intensity does not affect whether or not photoelectric emission occurs.
    21. 21. 3. Does the type of metal affect whether photoelectric emission occurs at a particular frequency?
    22. 22. Effect of metal on emission
    23. 23. Metal 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
    24. 24. 3. The type of metal does affect whether photoelectric emission occurs at a particular frequency.
    25. 25. RATE OF EMISSION Photoelectric Effect: Factors affecting
    26. 26. 4. How does the intensity of light affect the rate at which electrons are emitted during photoelectric emission?
    27. 27. Effect of intensity on rate of emission: f > f0
    28. 28. 4. Increasing light intensity increases the rate at which electrons are emitted from a metal when photoelectric emission does occur.
    29. 29. 5. How does the frequency of light affect the kinetic energy of the emitted electrons during photoelectric emission?
    30. 30. Effect of frequency on KE of emitted electrons
    31. 31. 4. Increasing the frequency of light, from the cut-off frequency, increases the kinetic energy of the electrons emitted during photoelectric emission.
    32. 32. energy photon gives energy e- needs to break free e- ‘s kinetic energy
    33. 33. LIGHT intensity colour has determined by light’s frequency determined by light’s amplitude photoelectric emissionmetal occurs from a determines if
    34. 34. LIGHT intensity colour has photoelectric emission determined by light’s frequency determined by emission rate PHOTONSconsists of energy carry amount of determined by metal determines if occurs from a of affects rate of

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