An electromagnetic wave moves in a straight line through a vacuum. Its frequency is $6.0\,\text{THz}$. How many wavelengths are contained in a distance of $1.0\,\text{m}$ measured along the wave?
- A$5.0 \times 10^{-5}$
- B$2.0 \times 10^{1}$
- C$2.0 \times 10^{4}$
- D$5.0 \times 10^{7}$