Question

According to the modern definition, what fraction of a second does light travel to define one metre?

Options

• 1/299,792,458 of a second

• 1/300,000,000 of a second

• 9,467,000,000,000,000 of a second

• One ten-millionth of a second

Answer 1

 

1/299,792,458 of a second

Explanation:

This value is the reciprocal of the exact speed of light in metres per second, forming the basis of the modern, precise definition of the metre.