photoelectric factors affecting
TRANSCRIPT
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Photoelectric Effect
Factors
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WHETHER EMISSION OCCURSPhotoelectric Effect: Factors affecting
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1. How does the frequency of light affect whether photoelectric emission occurs?
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Effect of f on emission
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1. Photoelectric emission only occurs when light of a metal’s cut-off frequency, or higher, shines on that metal.
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- - - - - - - -
- - - - - - - -f
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f
- - - - - - - -
- - - - - - - -
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f - - -
- - - -- - - -
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f- - -
- - - - - - - -
- - - - -
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f
- - - - - - - -
photoelectric emission
photoelectric emission
- - -- -- - -
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Zn’s cut-off wavelength
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f if = 288 nm (288 x 10-9m)
f = 1,04 x 1015 s-1
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Zn’s fo and o
1,04 x 1015 Hz
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LIGHT
intensity colou
r
has
photoelectric emission
determined by light’s
frequency
determined by
emission rate
PHOTONS
consists of
energy
carry amount of
determined by
metal
determines if
occurs from a
of
affects rate that
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LIGHT
colour
has
photoelectric emission
determined by light’s
frequency
PHOTONS
consistsof
energy
carry amount of
determined by
determines if
occurs from a
=f0<f0 >f0
if if
type determines f0W
0
W0
if each e- receives energy
has has >
is an amount of
metal
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2. How does the intensity of light affect whether photoelectric emission occurs?
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Effect of intensity on emission: f > f0
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Effect of intensity on emission: f < f0
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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.
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2. If the light’s frequency is above the metal’s cut-off frequency, photoelectric emission does occur, regardless of the light’s intensity.
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2. Light intensity does not affect whether or not photoelectric emission occurs.
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3. Does the type of metal affect whether photoelectric emission occurs at a particular frequency?
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Effect of metal on emission
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Metal 0 (nm) f0 (Hz) MoviePt 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
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3. The type of metal does affect whether photoelectric emission occurs at a particular frequency.
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RATE OF EMISSIONPhotoelectric Effect: Factors affecting
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4. How does the intensity of light affect the rate at which electrons are emitted during photoelectric emission?
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Effect of intensity on rate of emission: f > f0
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4. Increasing light intensity increases the rate at which electrons are emitted from a metal when photoelectric emission does occur.
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5. How does the frequency of light affect the kinetic energy of the emitted electrons during photoelectric emission?
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Effect of frequency on KE of emitted electrons
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4. Increasing the frequency of light, from the cut-off frequency, increases the kinetic energy of the electrons emitted during photoelectric emission.
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energy photon gives
energy e- needs to
break free
e- ‘s kinetic energy
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LIGHT
intensity
colour
has
determined by light’s
frequency
determined by light’s
amplitude
photoelectric emission
metal
occurs from a
determines if
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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
occurs from a
of
affects rate of