The kinetic energies of photoelectrons emitted from a metal are K₁ and K₂ when it is irradiated with lights of wavelength $λ_{1}$ and $λ_{2}$ respectively. The work function of the metal is _____.

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

$\frac{K_{1} λ_{1} + K_{2} λ_{2}}{λ_{2} + λ_{1}}$

$\frac{K_{1} λ_{2} + K_{2} λ_{1}}{λ_{2} + λ_{1}}$

$\frac{K_{1} λ_{1} - K_{2} λ_{2}}{λ_{2} - λ_{1}}$

$\frac{K_{1} λ_{2} - K_{2} λ_{1}}{λ_{2} - λ_{1}}$

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Given $\frac{h c}{λ_{1}} - W_{0} = K_{1}$ (i)

and $\frac{h c}{λ_{2}} - W_{0} = K_{2}$ (ii)

Eliminate hc from (i) and (ii), we get:

$W_{0} = \frac{K_{1} λ_{1} - K_{2} λ_{2}}{λ_{2} - λ_{1}}$

Watch 3-min video & get full concept clarity

JEE

NEET

Foundation JEE

Foundation NEET

CBSE