Quantum Flashcards
1
Q
What is a photon
A
A single packet of energy
2
Q
Photon Energy Equations ( 2 of them )
A
E = hf E = hc / λ
3
Q
What is the value for Planck’s Constant
A
6.63 x 10 ^ -34 J
4
Q
What is an electronvolt
A
1 eV = The energy transferred to or from an electron when it moves through a p.d of 1 V.
W = VQ
5
Q
How many Joules is 1 eV equal to
A
1.6 x 10^-19
6
Q
The photoelectric effect
A
The emission of electrons when EM radiation is shone on a material.
7
Q
How many electrons are emitted per photon
A
1 electron
8
Q
3 observations from photoelectric effect
A
- Electrons only emitted if incident radiation was above threshold frequency
- The emissions of electrons is instant
- Increasing intensity, increases the number of electrons emitted.
9
Q
De Broglie equation
A
wavelength = Planck’s constant / momentum
10
Q
Wave particle duality
A
A model which describes that all matter has both waves and particle properties.
