A satellite moves in orbit around the Earth at an altitude of $300\,\text{km}$ above the surface. The speed of electromagnetic waves is $3.0 \times 10^8\,\text{m s}^{-1}$. What is the least time for a radio signal sent from the Earth to arrive at the satellite?
- A$1.0 \times 10^{-6}\,\text{s}$
- B$2.0 \times 10^{-6}\,\text{s}$
- C$1.0 \times 10^{-3}\,\text{s}$
- D$2.0 \times 10^{-3}\,\text{s}$