Question 3 of 36 Mapoob Sapling Learning macmilan learning 200 nm) A sample of s

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Question 3 of 36 Mapoob Sapling Learning macmilan learning 200 nm) A sample of silver (with work function ?= 4.52 eV) is exposed to an ultraviolet light source( which results in the ejection of photoelectrons. What changes will be observed i r is replaced with gold (?-5.47 eV) O More photoelectrons ejected O Less energetic photoelectrons (on average) O More energetic photoelectrons (on average) O Fewer photoelectrons ejected O No photoelectrons are emitted The Incorrect. The maximum energy the photoelectrons can have is equal to the photon energy minus the workfunction A second (identical) light source also shines on the metal O O O No photoelectrons are emitted Fewer photoelectrons ejected Less energetic photoelectrons (on average) More photoelectrons ejected More energetic photoelectrons (on average) O 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 O No photoelectrons are emitted O Less energetic photoelectrons (on average) Previous ? Give Up & View Solution # Try Again Next Exit

Explanation / Answer

given sample of silver

work function, phi = 4.52 eV

lamnda = 200 nm

a. when silver os replaced with gold

phi' = 5.47 eV

now energy of photons = h*c/lambda = 6.215625 eV

hence, the photoelectrons will be ejected, but they will be less energetic in general

option c.

b. second source is shined, so the photoelectrons double in number

option d)

c. when UV is replaced by Xray, as X rys have more energy than UV rays

More energetic photoelectrons are emitted on average

option e)

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