A Hydrogen Atom Is Excited to The $n = 9$ Level Its Decay to The to The n

Multiple Choice

A hydrogen atom is excited to the $n = 9$ level. Its decay to the $n = 6$ level detected in a photographic plate. What is the frequency of the light photographed? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \right.$ . s)

A) $5910 \mathrm {~Hz}$
B) $3.28 \times 10 ^ { - 9 } \mathrm {~km}$
C) $5.08 \times 10 ^ { 13 } \mathrm {~Hz}$
D) $5910 \mathrm {~nm}$