What is the approximate speed of light in a vacuum?
- A. 3 × 10⁶ m/s
- B. 3 × 10⁸ m/s
- C. 3 × 10¹⁰ m/s
- D. 3 × 10⁵ m/s
Explanation
Light travels at approximately 3 × 10⁸ metres per second in a vacuum — about 300,000 kilometres per second. This is the maximum speed at which any information can travel, and light slows down in denser media such as glass or water.
Related questions
The refractive index of a medium is defined as
An optical fibre transmits light along its length by
A converging lens forms a real, inverted and magnified image when the object is placed
The power of a lens is measured in dioptres and is equal to
A short sighted person cannot see distant objects clearly because the image forms