Photoelectric Effect

Question 1

Support of the Ray model of light

Answer 1

A bean of light can be seen from a laser/ray box as a ray can be observed to REFLECT OR REFRACT as a ray

Question 2

what are the properties of a light WAVE

Answer 2

Light can be seen to have wave properties it refracts reflects and diffracts

Question 3

Particle model of light (corpuscle model)

Answer 3

Light behaved as a particle (a photon)

Question 4

What experiment demonstrated light having particle properties

Answer 4

Golden leaf experiment

Question 5

What factors effect the release of electrons

Answer 5

Frequency - higher the faster the electron

Power(intensity)- higher increases electrons release per second

Question 6

Einstein’s explanation of photons(interaction of photons and what their energy depends on)

Answer 6

Light composed of photons of energy in a fixed amount that depended on it frequency 1:1 interaction of photons and electrons

Question 7

Define intensity of light

Answer 7

Intensity of light source is proportional to the number of photons emitted per second

Question 8

Define electron volt

Answer 8

An eV is the work done moving one electron through a PD of 1V
1eV = 1.60x10^-19

Question 9

Define work function

Answer 9

The minimum energy of a photon required to release release one electron from the surface of a metal

Question 10

Photon energy equation

Answer 10

E= hf = hc/λ

Question 11

Photoelectric effect equasion

Answer 11

hf = φ +Ek(max)

Question 12

Threshold frequency

Answer 12

Minimum frequency of radiation required to cause an electron to be emitted
hfο=φ
(no kinetic energy as particle is only just realeased)

Question 13

Threshold wavelength

Answer 13

Wave length must be below the threshold wavelength to emit an electron
hc/λo =φ

Question 14

Stopping potential experiment

Answer 14

Millikan disagreed and did a peer review of photon theory

Measured the stopping potential of electrons emoted from the same metal at different frequencies using a photocell