NCERT Class XI Chemistry Structure of Atom Solutions

Question : 12

Total: 67

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate threshold frequency (u0) and work function (W0) of the metal.

Solution:

Threshold frequency
(υ0) =

3×108

6800×10−10

= 4.41 × 1014s−1 [1 Å = 10–10 m]
Work function (W0) = hυ0 = 6.626 × 10–34 × 4.41 × 1014 = 2.92 × 10–19J

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