PhysicsEasy145×since 2002Q6614The work function of a substance is 4.04.04.0 eV.eV.eV. The longest wavelength of light that can cause photo-electron emission from this substance is approximately.A310310310 nmnmnmB400400400 nmnmnmC540540540 nmnmnmD220220220 nmnmnmCheck answerSkip