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Physics-(general)

NEET Physics (general) MCQ Question

Type: MCQ-numerical-Medium-Class 12

If the work function of a metal is 2.14 eV, what is the maximum wavelength of incident light that can cause photoemission?

A

580 nm

B

540 nm

C

460 nm

D

420 nm

Correct Answer

Option C

Detailed Explanation

The maximum wavelength is calculated using the formula λ=hce×work function\lambda = \frac{hc}{e \times \text{work function}}. For a work function of 2.14 eV, λ=6.63×10−34×3×1081.6×10−19×2.14≈460 nm\lambda = \frac{6.63 \times 10^{-34} \times 3 \times 10^8}{1.6 \times 10^{-19} \times 2.14} \approx 460 \text{ nm}.

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