Light year is a unit of _____

The light from the sun reaches us in nearly_______

______is not used in the field of physics.

Which one type of radiation has the longest wave length

The working principle of a washing machine is _______

Who discovered X-ray

The energy of a photon varies directly with its

The unit of intensity of electric field is

Which physicists is the writer of the book 'A Brief History of Time'

The speed of sound travel fastest through