The metal mainly used in devising photoelectric cells is :

Question:

The metal mainly used in devising photoelectric cells is :

(1) $\mathrm{Na}$

(2) Li

(3) $\mathrm{Rb}$

(4) $\mathrm{Cs}$

  1. Na

  2. Li

  3. Rb

  4. Cs


Correct Option: , 4

Solution:

Cesium has lowest ionisation enthalpy and hence it shows photoelectric effect to the maximum extent. So, it is used in photo electric cell.

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