13.3+ 13.4 Einstein's Equation, wave particle duality

Question 1

what is a vacuum photocell?

Answer 1

a device which makes use of the photoelectric effect, to generate current

Question 2

what does a photocell look like?

Answer 2

• evacuated glass tube
• photoemissive plate (metal that can release eletrons via the PE) at one end and a metal plate at the other

Question 3

what is the short cut equation for kinetic energy?

Answer 3

Question 4

what does it mean when light is said to have “wave particle duality”

Answer 4

acts as both and is not defined as a single one

Question 5

what is the basis of the De Broglie Wavelength ?

Answer 5

states that all particles can be considered to have a wavelength

perhaps all particles have a wave light nature

Question 6

what is the de Broglie Wavelength Equation?

Answer 6

Question 7

what is the set up for electron diffraction?

Answer 7

electrons pass through carbon atoms forming an interference pattern

Question 8

what are some rules regarding electron diffraction?

Answer 8

1. electrons can only be diffracted by metal lattices (atom spacing is comparable to the de Broglie Wavelength0
2. electrons are only diffracted at certain angles (giving ring interference pattern)
3. velocity/kinetic energy of electrons can beincreased by increasing the accelerating potential between filament and node

increase speed= decrease the de Broglie Wavelength

Question 9

What is another form of de Brollies equation relating energy

Answer 9