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Q)

The threshold frequency for a metallic surface corresponds to energy of $6.2\: eV$ and the stopping potential for a radiation incident on this surface is $5V$. The incident radiation lies in

$\begin {array} {1 1} (a)\;Ultraviolet \: region & \quad (b)\;Infrared\: region \\ (c)\;Visible\: region & \quad (d)\;X-ray\: region \end {array}$

 

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A)
Ans : (a) Ultraviolet region
$hv_{\circ} = 6.2\: eV \:\: \: \: \: \: \: \: \: eV_{\circ} = 5eV$
So,$ hv = hv_{\circ} + eV_{\circ} = 6.2 + 5 = 11.2\: eV$
$ \Rightarrow hc/\lambda = 11.2$
$ \Rightarrow \lambda = hc/11.2 = 1108.9 A^{\circ}$ which is in ultraviolet region.

 

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