Which one is not a part of Kepler's Law

Ultrasound devices operate with minimum frequency from

Charles's law is based on

The unit of force is a

The three famous law of Kepler is related to

Which method can be applied to determine purity of a metal ?

The Newton's first law is also referred to as

Kirchhoff's laws are applicable to

Atomic hydrogen has a life period of

Boyle's law relates to