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  4. The work function for Al, K and Pt is 4.28 eV, 2.30 eV and 5.65 eV respectively. Their respective threshold frequencies would be

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Q. The work function for $Al,\, K$ and $Pt$ is $4.28\, eV,\, 2.30\, eV$ and $5.65\, eV$ respectively. Their respective threshold frequencies would be

Delhi UMET/DPMTDelhi UMET/DPMT 2011Dual Nature of Radiation and Matter

Solution:

Work function, $W_{0}=h v_{0}$
where $v_{0} =$ Threshold frequency
So, $W \propto v_{0}$
Hence $Pt > Al > K$