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

Question

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 (A)  Pt > Al > K  (B)  Al > Pt > K  (C)  K > Al > Pt (D)  Al > K > Pt

Tardigrade Admin · Accepted Answer

Work function, W0=h v0 where v0 = Threshold frequency So, W propto v0 Hence Pt > Al > K

Q. The work function for $A l, K$ and $Pt$ is $4.28 e V, 2.30 e V$ and $5.65 e V$ respectively. Their respective threshold frequencies would be

$Pt > A l > K$

$A l > Pt > K$

$K > A l > Pt$

$A l > K > Pt$

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

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

Pt>Al>K

Al>Pt>K

K>Al>Pt

Al>K>Pt