A sample of silver (with work function 4.52 eV) is exposed to an ultraviolet light source (lamba = 200 nm), which results in the ejection of photoelectrons. What changes will be observed if:

a) the silver is replaced with cerium (work function 2.90 eV)

b) half of the ultraviolet light from the source is blocked

c) the ultraviolet source is replaced with a red laser that emits the same number of photons per unit time as the original light source

Choice are: less energetic photoelectrons, more photoelectrons ejected, more energic photoelectrons, no change, no photoelectrons admitted, fewer photoelectrons ejected.