When It Is Struck By $240 - \mathrm { nm }$

Multiple Choice

When it is struck by $240 - \mathrm { nm }$ photons, a metal ejects electrons with a maximum kinetic energy of $2.58 \mathrm { eV }$ . What is the work function of this material? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } \right.$ $= 16.0 \times 10 ^ { - 19 } \mathrm {~J}$ )

A) $3.02 \mathrm { eV }$
B) $2.60 \mathrm { eV }$
C) $3.43 \mathrm { eV }$
D) $2.18 \mathrm { eV }$