A Certain Part of the Electromagnetic Spectrum Ranges From $200 \mathrm {~nm}$

Multiple Choice

A certain part of the electromagnetic spectrum ranges from $200 \mathrm {~nm}$ to $400 \mathrm {~nm}$ . What is the lowest frequency associated with this portion of the spectrum? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

A) $7.50 \times 10^{13} \mathrm {~Hz}$
B) $7.50 \times 10^{15} \mathrm {~Hz}$
C) $1.50 \times 10^{15} \mathrm {~Hz}$
D) $1.50 \times 10 ^ { 14 } \mathrm {~Hz}$
E) $7.50 \times 10 ^ { 14 } \mathrm {~Hz}$