Question

The speed of light is maximum in

• A. Vacuum.
• B. Kerosene.
• C. Diamond.
• D. Water.

Answer 1

The correct option is A

Vacuum.

Explanation for the correct option

A: Vacuum

1. The speed of light is maximum in vacuum.
2. The light travels at a speed of $3\times {10}^{8}m/s$ in vacuum.

Explanation for the incorrect option(s)

B: Kerosene

1. The speed of the light in kerosene is $2.08\times {10}^{8}m/s$.

C: Diamond

1. The speed of the light in diamond is $1.25\times {10}^{8}m/s$.

D: Water

1. The speed of the light in water is $2.25\times {10}^{8}m/s$.

Thus, the speed of light is maximum in vacuum. Hence option A is the correct answer.