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

Multiple Choice

When it is struck by $240 - \mathrm { nm }$ photons, a material having a work function of $2.60 \mathrm { eV }$ emits electrons. What is the maximum kinetic energy of the emitted electrons? ( $c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times$ $10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } = 1.60 \times 10 ^{- 19} \mathrm {~J}$ )

A) $4.21 \mathrm { eV }$
B) $2.00 \mathrm { eV }$
C) $2.58 \mathrm { eV }$
D) $5.18 \mathrm { eV }$