study guide 7

Question 1

what is set up for photoelectric effect experiemnts

Answer 1

shine light at metal then electrons are ejected (draw it)

Question 2

what can photoelectric effect measure

Answer 2

the KE or # of electrons ejected if they are ejected

Question 3

observations of photoelectric effect experiemnt

Answer 3

1)below threshold frequency or above threshold wavelength no electrons ejected regarless of intensity of light source
2)above threshold frequency, electron are ejected and the max KE of electron varies linearly with frequency (# OF ELECTRONS DOES NOT CHANGE)
3) if intesnity of light increases, number of electron ejected increases (NO EFFECT ON KE)
4)all metals show this beahvior but each has unique threshold freequency

Question 4

what was surpirsing about observations of photoelectric effect experiemnt

Answer 4

if light is a wave, hugher amplitude should provide more inetnse vibrations to metal atoms allowing release of electrons. But low frequency light does nothing regardless of inetensity

Question 5

What was Einstein’s explanation for the observations in the photoelectric effect?

Answer 5

light comes in discrete packets (photons)

Question 6

What is the work function of a metal?

Answer 6

Ephoton= WORK + max KE

Question 7

Why is the photoelectric effect and example of conservation of energy?

Question 8

draw energy diagram

Answer 8

ok