Question

1. What is an atomic clock? Where is it kept?
2. How is the velocity of light used for determining the
standard metre?​

Answer 1

Answer:

Hey dear,

Here's ur answer,

Answer1 : An atomic clock is a clock device that that uses an electronic transition frequency in the microwave, optical or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.

Answer2 : Velocity of the light in air or vaccum = 3 × 10^8 m/s. For the convinence, We used to take the value as 3 × 10^8 m/s. Although, For determine the definition of the metre, correct speed of the light is taken. 1 meter is defined as the distance travelled by the light in 1/299792000 s.

I think it helps u..