Question

The speed of light in vacuum is:

• A. $2\times {10}^{8}m/s$
• B. $1\times {10}^{8}m/s$
• C. $3\times {10}^{7}m/s$
• D. $3\times {10}^{8}m/s$

Answer 1

The correct option is D

$3\times {10}^{8}m/s$

• The speed of light in vacuum is $3\times {10}^{8}m/s$.
• The vacuum is a space where there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there.

Hence, the correct answer is option (D) $3\times {10}^{8}m/s$