What Is the Longest Wavelength of Electromagnetic Radiation That Will $2.28 \mathrm { eV }$

Multiple Choice

What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is $2.28 \mathrm { eV }$ ? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , 1 \right.$ $\mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J}$ )

A) $499 \mathrm {~nm}$
B) $580 \mathrm {~nm}$
C) $545 \mathrm {~nm}$
D) $633 \mathrm {~nm}$
E) $668 \mathrm {~nm}$