M4- C13 Flashcards
1
Q
Photons
A
Packets of energy
2
Q
Planck constant
A
6.63x10^-19
3
Q
Electron volt (eV)
A
The energy transferred to or from an electron when it moves through a potential difference of 1V
4
Q
J to eV
A
Divide by Planck constant
5
Q
eV to J
A
X by Planck constant
6
Q
Photoelectric effect
A
The emission of photoelectrons from a metal surface when electromagnetic radiation above a threshold frequency is incident on the metal
7
Q
Photoelectrons
A
Electrons emitted from the surface of the metal by the photoelectric effect
8
Q
Key observations of photoelectric effect
A
- Photoelectrons were omitted only if the incident radiation was above the threshold frequency
- If the incident radiation was above the threshold frequency, emission of photoelectrons was instantaneous
- Kinetic energy is affected by frequency not intensity
9
Q
Work function
A
The minimum energy required to free an electron from the surface of the metal
10
Q
De broglie equation
A
Wavelength= Planck constant/ momentum
