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The work function of metals is in the range of 2 eV to 5 eV.

The work function of metals 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, planck constant=4×10⁻¹⁵ eVs, velocity of light =3×10⁸ ms⁻¹)

Options

(a) 510 nm
(b) 650 nm
(c) 400 nm
(d) 570 nm

Correct Answer:

650 nm

Explanation:

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