UV light of wavelength =200nm is incident on a material, causing electrons to es

Question

UV light of wavelength =200nm is incident on a material, causing electrons to escape a cathode and be detected at an anode. A negative potential is gradually applied across the cathode and anode until zero current is found at V=1.116V

Part A - What is the work function for the material, and what material is it?

Part A - What is the work function for the

material, and what material is it?

E0=4.65 eV , Copper

E0=4.55 eV , Tungsten

E0=4.70 eV , Iron

   E0=5.10eV , Gold

   E0=2.75eV , Sodium

   E0=2.30eV , Potassium

   E0=4.28eV , Aluminum

Explanation / Answer

Energy of electrons released = hc/lamda

E = (6.626*10^-34*3*10^8)/(200 * 10^-9)

E = 9.939 * 10^-19 J

E = (9.939*10^-19)/(1.6 * 10^ -19)

E = 6.211875 eV

Work function = E + Ke

Work function = 6.211875 -1.116 = 5.10 EV

EO = 5.10eV gold

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