A Metal Surface Has a Work Function Of $2.50 \mathrm { eV }$

Short Answer

A metal surface has a work function of $2.50 \mathrm { eV }$ . What is the longest wavelength of light that will eject electrons from the surface of this metal? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , c = 3.00 \times 10 ^ { 8 } \right.$ $\mathrm { m } / \mathrm { s } , h = 6.626 \times 10^{- 34} \mathrm {~J} \cdot \mathrm { s } )$