Question

How many vibrations of cesium-133 radiation occur in exactly one second?

Options

• 1,000,000,000

• 5,000,000,000

• 9,192,631,770

• 10,000,000,000

Answer 1

9,192,631,770

Explanation:

One second is officially defined as the time it takes for 9,192,631,770 vibrations of the radiation from a caesium-133 atom.