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Energy Band Diagrams

The threshold...

Question

The threshold wavelength is 2000 $A^{o}$ . The work function is

A

6.25 eV

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B

6.2 eV

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C

6.2 MeV

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D

6.2 keV

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Solution

The correct option is B 6.2 eV
$ϕ = \frac{h c}{λ}$

$= \frac{1240}{200} (h c = 1240 e V - n m)$

$= 6.2 e V$
So, the answer is option (B).

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