Using a Vacuum Cleaner in a Vacuum

Sunlight reaches to us in composite from and not in it’s constituent colours because vacuum is non- dispersive . speed of all colours is same in vacuum. light behaves like a particle in vacuum. light travels in a straight line in vacuum

A satellite in vacuum

The velocity of light in vacuum can be changed by changing

Why does a siphon fail to work in vacuum?

Transistors may not replace vacuum tubes in all uses because

The susceptibility of a substance in vacuum is