# Physics quantum physics

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• Created by: abbin003
• Created on: 19-02-20 08:25
What is a photon
Tiny packet of energy
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Photon energy equations
E=hf or E=hc/λ
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Define the electron volt
The energy transferred to or from an electron when it moves through a pd of 1v
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What is the photoelectric effect
When high energy electromagnetic radiation causes electrons to be emitted from a metal
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What are the three observations of the photoelectric effect
Photoelectrons were Emmited only if the incident radiation was above the threshold frequency. If it was above this frequency emission of photoelectrons was instantaneous.increasing intensity of radiation increased the number of electrons emitted
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Continuing the third observation>>>>>
Only way to increase the maximum kinetic energy was to increase the frequency of the incident radiation
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What is the work function
This is the minimum energy required to free an electron from the surface of the metal
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Photoelectric effect equation
hf=ϕ+KE max
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What is de broglie equation
λ=h/p
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What do you put in an electron gun and why
Thin peice of polycrystalline graphite because the gap between the atoms is similar to the wavelength of the electrons so the electrons diffract
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## Other cards in this set

### Card 2

#### Front

Photon energy equations

E=hf or E=hc/λ

### Card 3

#### Front

Define the electron volt

### Card 4

#### Front

What is the photoelectric effect

### Card 5

#### Front

What are the three observations of the photoelectric effect