First slide

Dimensions of physical quantities

Question

The pairs of physical quantities that have not the same dimensions is (are)

Moderate

A

Reynold's number and coefficient of friction
B

Curie and frequency of a light wave
C

Latent heat and gravitational potential
D

Planck's constant and torque

Solution

Reynold's number and coefficient of friction are dimensionless quantities. Curie is the number of atoms decaying per unit time and frequency is the number of oscillations per unit time. Latent heat and gravitational potential both have the same dimension corresponding to energy per unit mass.

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