Question

Light of wavelength 400 nm is incident continuously on a cesium ball (work function 1.9 eV) The maximum potential to which the ball will be charged is-

• A. 3.1 V
• B.
  1. 2V
• C. Zero
• D. Infinite

Answer 1

Answer: (B)

1. 2V

Answer 2

eV_s = $\frac { 12400 } { 4000 } - 1.9$

= 3.1 – 1.9

eV_s = 1.2 eV

V_s = 1.2 V