Photoelectron question?

A sample of silver (with work function Φ=4.52 eV) is exposed to an ultraviolet light source (𝜆=200 nm), which results in the ejection of photoelectrons. What changes will be observed if: The silver is replaced with cobalt (Φ=5.00 eV)? a) less energetic photoelectrons (on average) b) fewer photoelectrons ejected c)... show more A sample of silver (with work function Φ=4.52 eV) is exposed to an ultraviolet light source (𝜆=200 nm),
which results in the ejection of photoelectrons. What changes will be observed if:
The silver is replaced with cobalt (Φ=5.00 eV)?
a) less energetic photoelectrons (on average)
b) fewer photoelectrons ejected
c) more energetic photoelectrons (on average)
d) no photoelectrons are emitted
e) more photoelectrons ejected

A second (identical) light source also shines on the metal?
a) less energetic photoelectrons (on average)
b) no photoelectrons are emitted
c) more photoelectrons ejected
d) more energetic photoelectrons (on average)
e) fewer photoelectrons ejected

The ultraviolet source is replaced with an X‑ray source that emits the same number of photons per unit time as the original ultraviolet source?
a) no photoelectrons are emitted
b) more energetic photoelectrons (on average)
c) more photoelectrons ejected
d) fewer photoelectrons ejected
e) less energetic photoelectrons (on average)
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