The work function for a metallic surface

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Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The work function for a metallic surface is 4.0 eV. The longest wavelength of light that can cause photoelectron emission is approximately

Options:

540 nm

400 nm

310 nm

220 nm

Correct Answer:

310 nm

Explanation:

The correct answer is Option (3) → 310 nm $n^{2}$