Question

If work function of target material is 2.34 eV and
wavelength of incident light is 4.36 × 10-7 m then
minimum potential required to stop the photocurrent is about (h = 6.6 × 10-34 Js)
(1) 1.5 V
(2) 0.5 V
(3) 2 V
(4) Zero​

Answer 1

2) 0.5 V....

Answer 2

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ANSWER

Given,

Work function, ϕ=2.34eV

wavelength, λ=4.36×10

−7

m

Planck's constant,h=6.6×10

−34

Js

By Einstein photoelectric equation,

K.E=

λ

hc

−ϕ

K.E=

4.36×10

−7

×1.6×10

−19

6.6×10

−34

×3×10

8

eV

−2.34eV

K.E=2.838eV−2.34eV

K.E=0.5eV

The kinetic energy is equal to eV

0

where, V

0

=stopping potential

eV

0

=0.5eV

V

0

=0.5V

The correct option is B.

Answered By=shreyash .........

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