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JEE Main 20253 AprilMorning Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Morning Shift
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2025 · 3 April · Morning Shift · Physics · Dual Nature of Matter

The work function of a metal is 3 eV. The color of the visible...

The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons is

Options

  1. AGreen
  2. BBlue
  3. CRed
  4. DYellow

Correct answer

B. Blue

Step-by-step solution

(KE)max⁡=hcλ−ϕhcλ>ϕ[ for emission ]λ<hcϕ⇒λ<12423nm\begin{aligned}& (\mathrm{KE})_{\max }=\frac{\mathrm{hc}}{\lambda}-\phi \\ & \frac{\mathrm{hc}}{\lambda} > \phi[\text{ for emission }] \\ & \lambda < \frac{\mathrm{hc}}{\phi} \Rightarrow \lambda < \frac{1242}{3} \mathrm{ nm}\end{aligned}So blue light option (B)
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