(4) Electrons are no longer ejected from a sample of metal whenever it is illuminated by light with wavelength greater than 428nm. (a) Based on the table below, what is the most likely metal being illuminated? (b) If the sample is illuminated by light with wavelength 177nm, what is the stopping potential?
(4) Electrons are no longer ejected from a sample of metal whenever it is illuminated by light with wavelength greater than 428nm. (a) Based on the table below, what is the most likely metal being illuminated? (b) If the sample is illuminated by light with wavelength 177nm, what is the stopping potential?
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Transcribed Image Text:(4) Electrons are no longer ejected from a sample of metal whenever it is illuminated by light
with wavelength greater than 428nm.
(a) Based on the table below, what is the most likely metal being illuminated?
(b) If the sample is illuminated by light with wavelength 177nm, what is the stopping
potential?
(c) In the event this sample of metal were replaced by a metal with a smaller work
function, but still illuminated with light with 177nm, would the kinetic energy of the ejected
electrons increase or decrease? Explain your reasoning
(d) What is the threshold frequency for niobium?
Atom
Cesium
W (eV)
2.1
Calcium
2.9
Uranium
3.6
Cadmium
4.07
Lead
4.14
Niobium
4.3
Iron
4.5
Copper
4.7
Cobalt
5
Gold
5.11
Platinum
6.35
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