A prokaryotic cell has an actual diameter of $0.5\,\mu\text{m}$. The cell is shown in an electron micrograph at a magnification of $\times 50\,000$. What is the diameter of the cell in the image?
- A$2.5 \times 10^{-1}\,\text{mm}$
- B$2.5 \times 10^{0}\,\text{mm}$
- C$2.5 \times 10^{1}\,\text{mm}$
- D$2.5 \times 10^{2}\,\text{mm}$