Question: A sample of silver (with work function Φ=4.52 eV ) is exposed to an ultraviolet light source (wavelength=200 nm), which results in the ejection of

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

The silver is replaced with cesium (Φ=2.14 eV) ?

no photoelectrons are emitted

more energetic photoelectrons (on average)

less energetic photoelectrons (on average)

fewer photoelectrons ejected

more photoelectrons ejected

-

Half of the ultraviolet light from the source is blocked?

fewer photoelectrons ejected

no photoelectrons are emitted

more energetic photoelectrons (on average)

less energetic photoelectrons (on average)

more photoelectrons ejected

-

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

no photoelectrons are emitted

fewer photoelectrons ejected

more energetic photoelectrons (on average)

more photoelectrons ejected

less energetic photoelectrons (on average)

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Answer The kinetic energy of the photoelectrons emitted from a metal surface is given by KE h where h is Plancks constant is the frequency of the inci... View full answer

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