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  • Will photoelectrons be emitted from a copper surface, of work function 4.4eV, when illuminated by a visible light?Option: 1 Yes<di

Will photoelectrons be emitted from a copper surface, of work function 4.4eV, when illuminated by a visible light?

Option: 1

Yes


Option: 2

No


Option: 3

Depends on the atmospheric temperature


Option: 4

None of the above


Answers (1)

best_answer

 

The threshold wavelength λo corresponding to work function W is given by
\lambda_{0}=\frac{h v}{W} \text { or } \lambda_{0}=\frac{12400}{4.4}=2820 A

Since λo  does not lie in the visible range (4000A→7500A), therefore it cannot eject photoelectrons from copper.

Posted by

Sanket Gandhi

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