Question

Mention any 3 dimensionless and unitless quantites​

Answer 1

Answer:

A dimensionless physical quantity may have an unit (e.g. Mechanical equivalent of heat) but a unitless physical quantity is always dimensionless (e.g. Coefficient of friction , refractive index).

Answer 2

Answer:

The dimensions of a physical quantity are the powers (or exponents) to which the base quantities are raised to represent that quantity. 

Angle and solid angle has radians as units.

Mechanical equivalent of heat has joules as unit

.

Refractive index of a material is a dimensionless number.

n=c/v

n = refractive index

c = speed of light in vacuum

v = speed of light in medium

Explanation:

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