BYJU'S Physics Faculty Interview Questions and Answers

Relative density is the ratio of the density of a substance to the density of a reference substance.

• Relative density is also known as specific gravity.

• It is a dimensionless quantity.

• It is often used in the context of comparing the density of liquids or solids to that of water.

• For example, the relative density of gold is 19.3, meaning it is 19.3 times denser than water.

Persistence of vision is the phenomenon where the human eye retains an image for a fraction of a second after the image has disappeared.

• It is the reason why movies and animations appear to be continuous motion, even though they are actually a series of still images shown quickly.

• This phenomenon is utilized in various optical illusions and magic tricks.

• Persistence of vision is also the principle behind the functioning o...read more