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  4. The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then

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Q. The work function for sodium surface is $2.0\, eV$ and that for aluminium surface is $4.2\, eV$. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then

Dual Nature of Radiation and Matter

Solution:

As work function $W=h v_{0}$, where $v_{0}$ is the threshold frequency.
Greater the work function, greater is the threshold frequency. Therefore, the threshold frequency of sodium will be lesser than that for aluminium.