Lecture 1 Flashcards
What is a waves properties
Superposition (when they hit each other they pass through
Diffraction (when it goes through opening it splits in diff directions)
Transmission/ reflection (when it hits boundary a potion reflect and a portion transmits)
Resonance
Interference (with each other)
What is wave length
What is period
The distance of a wave from peak to peak
The time it take to get from peak to peak
What is frequency
Cycles/ second
So. 1/T since T is seconds/cycle
What are particles
They are things that collide and bounce off
When hitting a boundary they are non splittable
They don’t defract
What is the exception for photons
It is a wave that acts like a particle
Depending on the frequency of the photons, light can pass through
During moving and e- It doesn’t split into reflection and transmission.
Ex. If a photon is moving an e- it need to have higher NRG than the e- to move it
What are examples of particles that act like waves
Photons : diffraction, interference, superposition
Electrons: diffraction, interference
Neutrons
What is the double slit experiment
There is a light or sound wave source and it goes through two gaps in a metal sheet
The wave diffracts and makes an interference pattern of loud/quiet, bright/dim
What does a single photon do in the double slit experiment
It acts as a wave and takes both paths at the same time
The single photon interferes with itself to make the interference pattern
What is quantization
A discrete amount of something, it’s in one place or the other
When can absorbance occur
Only when
hf= E1-E0 (when the photon energy match the space between E1 and E0
What happens during absorbance if you bring atoms closer together
What happens if more collide
What happens if more and more collide
The energy levels split
You get HOMO and LUMO
You get an unpopulated band (valence band) and a populated band of e- (conduction band)
What are the types of quantized energy levels
Continuous spectrum (blend of all atoms)
Emmision lines (one atom emmision)
Absorption lines (one atoms absorption)
When light is emmited, what direction does it come off in
Only one direction, this is how it shows particle behaviour
What are the types of quantized energy levels and how do they manifest
Electronic : in discrete atomic transitions
Light/photons: manifests in being unable to split photons, single photons emmited from an atom, the double slit experiment
Vibrations/phonons in bulk material: vibrational spectra, black body radiation,
Higher frequency is more like a
Low frequency is more like a
Particle since higher energy
Wave since low energy
