Question

The speed of light in vacuum is ______.

Options

• $$3 \times 10^6\text{ ms}^{-1}$$

• $$3 \times 10^7\text{ ms}^{-1}$$

• $$3 \times 10^8\text{ ms}^{-1}$$

• $$3 \times 10^10\text{ ms}^{-1}$$

Answer 1

The speed of light in vacuum is `bbunderline{3 xx 10^8  ms^{-1}`.

Explanation: 

The speed of light in vacuum is a universal physical constant equal to approximately $$3 \times 10^8\text{ ms}^{-1}$$. The other choices have incorrect powers of 10.