Factors affecting the occurrence and rate of photoelectric emission

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.

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photoelectric emission
photoelectric emission
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11. Zn’s cut-off wavelength

14. 1,04 x 1015 Hz

15. 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

16. 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

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 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 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 light’s
frequency
determined by light’s
amplitude
photoelectric emissionmetal
occurs
from a
determines if

39. 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