Assertion :- Visible light cannot eject photo-electrons from copper...

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Assertion :- Visible light cannot eject photo-electrons from copper surface, whose work
\( \mathrm{P} \) function is \( 4.4 \mathrm{eV} \).

W
Reason :- The threshold wavelength for copper
- surface is given by \( \lambda_{0}=\frac{h c}{\phi_{0}}=\frac{12400}{4.4}=2818 \AA \) which is less than the wavelength of visible light - \( (3800 \AA \) to \( 7800 \AA \) ).
(1) A
(2) \( \mathrm{B} \)
(3) \( \mathrm{C} \)
(4) D
- (A) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
_ (B) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
- (C) Assertion is correct, but reason is wrong statement.
- (D) Assertion is wrong, but reason is correct statement.
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