Quantum Flashcards
1
Q
wiens law
A
the peak wavelength [where an object emits the max intensity of radiation] is dependent on temperature
2
Q
explain the photocurrent against voltage graph
A
- voltage on x-axis
- current on y-axis
- v becomes negative
- the current reduces until it reaches a stopping voltage
- different lines = different intensities
3
Q
rutherford model
A
- fired + alpha particles on gold foil
- some particles deflected
- implying a + charged centre
- atom has dense nucleus surrounded by e-
4
Q
limitation of rutherford model
A
electrons undergoing constant acceleration to stay in their orbits -> continuously emit EMR -> loss of energy causes electrons to spiral towards the nucleus
5
Q
bohr model
A
- can only exist in certain energy states
- they emit or absorb energy when jumping from the energy states
- when e- goes from upper to lower energy state, a photon is emitted of a specific wavelength
- gives us emission spectrum lines
6
Q
how is light a wave
A
- youngs double slit
- series of bright and dark bands
- demonstrates interference
- wave property
7
Q
how is light a particle
A
- photoelectric effect
- light is made of particles of energy which are emitted above f0
- this suggests light is delivering energy as discrete photons and not a continuous wave
8
Q
3 features of the photoelectric effect
A
- intensity of light is proportional to number of photoelectrons
- threshold frequency
- kinetic energy is proportional to frequency of light
9
Q
explain blackbody radiation
A
spectrum of radiation emitted is due to the objects thermal energy
10
Q
how does bbr show light as a particle
A
describe quantised nature of light as electrons emit/absorb energy in discrete amounts
11
Q
emission spectrum
A
- lines relate to wavelength of light produced by the release of energy from an e-
- visible light 400-700
