A Metallic Surface Is Illuminated with Light of Wavelength $400 \mathrm {~nm}$

Short Answer

A metallic surface is illuminated with light of wavelength $400 \mathrm {~nm}$ . If the work function for this metal is $2.40 \mathrm { eV }$ , what is the maximum kinetic energy of the ejected electrons, in electron-volts? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$