NCERT Class XI Chemistry Structure of Atom Solutions

Question : 53

Total: 67

The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.

Solution:

Energy of incident radiation (E) =

6.626×10−34×3×108

256.7×10−9

= 0.0774 × 10−17 = 7.74 × 10−19J = 4.83 eV
[Since 1.602 × 10−19J = 1 eV]
The potential applied gives the kinetic energy to the electron.
Hence, K.E. of electron = 0.35 eV
∴ Work function = (4.83 – 0.35) eV = 4.48 eV

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