CUET Preparation Today
The work function for a metallic surface is 4.0 eV. The longest wavelength of light that can cause photoelectron emission is approximately |
540 nm 400 nm 310 nm 220 nm |
310 nm |
The correct answer is Option (3) → 310 nm According to photoelectric equation, Work function, $\phi=hv_0=\frac{hc}{λ}$ $⇒λ=\frac{hc}{\phi}=\frac{4.14×10^{-15}×3×10^8}{4}$ $=310nm$ |
