What were the 3 observation about the photoelectric effect.
- the emission doesn't take plave below the threshold frequency.
- the number of electrons is proportional to the intensity.
- emission occurs without delay, regardless of intensity.
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What is light composed of?
Photons.
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What were the 3 effects that Einstein said?
- When light is shown upon the surface the electron gains the same energy of a photon.
- An electron can exceed the work function and escape the metal surface.
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What is the maximum kinetic energy of an electron?
max = hf - work function
or
hf = max + work function
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How does emission take place?
when the max is > 0
so hf > work function
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how do you calculate the threshold frequency?
Threshold frequency = work function / Planck's constant
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How do you attract electrons back?
you positively charge the object and this potential is called stopping potential. (Vs)
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How much work does the electron do equal to the stopping potential.
equal to e x Vs
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Other cards in this set
Card 2
Front
What were the 3 observation about the photoelectric effect.
Back
- the emission doesn't take plave below the threshold frequency.
- the number of electrons is proportional to the intensity.
- emission occurs without delay, regardless of intensity.
Card 3
Front
What is light composed of?
Back
Card 4
Front
What were the 3 effects that Einstein said?
Back
Card 5
Front
What is the maximum kinetic energy of an electron?
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