When ultraviolet light with a wavelength of 280 nm is incident on a particular m

Question

When ultraviolet light with a wavelength of 280 nm is incident on a particular metal surface, electrons are emitted via the photoelectric effect. The maximum kinetic energy of these electrons is 1.20 eV.

When ultraviolet light with a wavelength of 280 nm is incident on a particular metal surface, electrons are emitted via the photoelectric effect. The maximum kinetic energy of these electrons is 1.20 eV (a) What is the work function of the metal? ev (b) What is the threshold frequency for this particular metal? HZ

Explanation / Answer

from enstein photo electric effect equaiton

E = W +KEmax

KEmax =1.2 eV

E = hc/lamda

E(eV) =1243/lamda(nm)

lamda = 280 nm

E = 1243/280 = 4.44eV

W = 4.44 -1.2

work function W = 3.24 eV

(b) W = hfo

3.24*1.6*10^-19 = 6.63*10^-34*fo

fo = 7.82*10^14 Hz

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