Question

The photoelectric threshold wavelength for a material is 500 nm. Find the work function.

Answer 1

Answer:

ANSWER

Given, λ=5000A

o

=5×10

−7

m,

h=6.6×10

−34

Js

c=3×10

8

ms

−1

The work function of sodium

W=

λ

hc

W=

5×10

−7

6.6×10

−34

×3×10

8

or W=3.96×10

−19

J

or W=2.47eV [∵1eV=1.6×10

−19

J]

or W=2.5eV [Approximately]

Explanation:

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