Question

Which of the following is not dimensionless? A. Relative refractive index B. Relative permittivity C. Relative density D. Relative velocity

Answer 1

What is Different Between Derived quantity And Basic quantity?

Answer 2

Answer:

Relative velocity is not dimensionless

Explanation:

Which of the following is not dimensionless?

A. Relative refractive index

B. Relative permittivity

C. Relative density

D. Relative velocity

Relative refractive index  = ratio of the speed of light in a vacuum to that in the given medium so Dimensionless

Relative permittivity  is  ratio relative to the vacuum permittivity. so dimensionless

Relative density  = ratio of the density of a substance to the density of a standard so Dimensionless

Relative velocity is not ratio but in comparison to another frame

so Relative velocity dimension is Dimension of Velocity = L/T

so Relative velocity is not dimensionless