The Work Function of a..... | JEE Main 2024

JEE-Main_2024

30.01.24_(S1)

Question

The work function of a substance is 3.0eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

Select the correct option:

215 nm

414 nm

400 nm

200 nm

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & \text { For P.E.E. : } \lambda \leq \frac{h c}{w_e} \\ & \lambda \leq \frac{1240 \mathrm{~nm}-\mathrm{eV}}{3 e V} \\ & \lambda \leq 413.33 \mathrm{~nm} \\ & \lambda_{\max } \approx 414 \mathrm{~nm} \text { for P.E.E. }\end{aligned}$

Question Tags

JEE Main

Physics

Easy

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