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:

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Chemistry

Cruz Fitzgerald

28 July, 07:31

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:

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Jonah Wade · Answer 1

Work function of metal = hc/e h=planck's constant c=speed of light in vacuum = threshold wavelength = 285nm e=1.6 x 10^-19 So = (6.63x10^-34) x (3 x 10^8) / (285x10^-9 x 1.6 x 10^-19) = 4.36 eV Maximum energy of emitted electrons = Energy incident - work function = hc/e (where = 140nm) = (6.63x10^-34) x (3 x 10^8) / (140x10^-9 x 1.6 x 10^-19) - 4.36 = 8.88 - 4.36 = 4.52 eV