What approximate frequency range does infra-red radiation have?
- A$1 \times 10^{3}\,\text{Hz}$ to $1 \times 10^{9}\,\text{Hz}$
- B$1 \times 10^{9}\,\text{Hz}$ to $1 \times 10^{11}\,\text{Hz}$
- C$1 \times 10^{11}\,\text{Hz}$ to $1 \times 10^{14}\,\text{Hz}$
- D$1 \times 10^{14}\,\text{Hz}$ to $1 \times 10^{17}\,\text{Hz}$