9/15 class notes

Question 1

observations of photoelectric effect

Answer 1

1)below a threshold frequency (v1) ie or above a threshold wavelength (lambda) no electrons ejected regardless or the intensity of the light source
2)above a threshold frequency , e are ejected regardless of intensity of the light source
3)if intensity of light os varied this effects the number of ejected e but has no effect on max KE
4)all metals show this behavior but each has its own unique threshold frequency

Question 2

what was the surprise that came with photoelectric effect

Answer 2

if light is a wave, higher amplitude should proide more intense variations to metal atoms allowing to release e. But low frequency light does nothing regardless of intensity

Question 3

is amplitude increased when electrons are ejected

Answer 3

yes

Question 4

which light has higher frequency, red or blue

Answer 4

blue

Question 5

Einstein’s explanation of photoelectric effect

Answer 5

light comes in discrete energy packets (photons)

Question 6

what are photons

Answer 6

quantized entities

Question 7

work is equal to

Answer 7

hv