Question

The wavelength of electromagnetic radiations $A$, $B$ and $C$ are given below :

Electromagnetic radiation	Wavelength
$A$	$4\times {10}^{-9}m$
$B$	$0.1\times {10}^{-9}m$
$C$	$10\times {10}^{-9}m$

Which of the above electromagnetic radiations causes photoelectric effect in most number of metals? Give scientific reason for this.

Answer 1

The electromagnetic radiation B causes photoelectric effect in most number of metals.
Reason : The radiation B has least wavelength and hence has high frequency. It causes photoelectric effect in many number of metals having different threshold frequencies.