Question

for which metal the value of work function is minimum​

Answer 1

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Answer 2

Answer:

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12th

Physics

Dual Nature of Radiation and Matter

Photons and Photoelectric Effect

The work function of metal ...

PHYSICS

The work function of metal is in the range of 2 eV to 5 eV. Find which of the following wavelength of light cannot be used for photoelectric effect:

(Consider, Plank constant =4×10

−15

eVs, velocity of light =3×10

7

ANSWER

Given that, 2eV≤ϕ≤5eV

Wavelength corresponding to minimum and maximum values of work function are

λ

max

=

E

hc

=

2

4×10

−15

×3×10

3

=6×10

−7

m=600nm

And λ

min

=

E

hc

=

5

4×10

−15

×3×10

8

=2.4×10

−7

m=240nm

Clearly, wavelength range would be: 240≤λ≤600

Thus, wavelength 650 nm is not suitable for photoelectric effect.