The minimum energy required to eject an electron from a metal surface is 4.5 eV. What is the maximum wavelength of light that can eject an electron?
Q1. The minimum energy required to eject an electron from a metal surface is 4.5 eV. What is the maximum wavelength of light that can eject an electron?
Answer: 275 nm
Explanation: λ = hc/E = (6.63×10^-34 × 3×10^8)/(4.5 × 1.6×10^-19) = 275 nm. Other options miscalculate or use wrong units.