Question

The pair of physical quantities, that have difference dimensions is

• A. Planck's constant and angular momentum
• B. Energy density and pressure
• C. Relative density and plane angle
• D. Specific heat capacity and latent heat

Answer 1

Answer: (A)

Planck's constant, symbolized h, relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.

$h=\frac{E}{v}=\frac{\left[M{L}^2{T}^{-2}\right]}{\left[T^{-1}\right]}=\left[M{L}^2{T}^{-1}\right]$

Angular momentum $=$ Moment of inertia $\times$ Angular velocity (Angular momentum)

$=\left[M{L}^2\right]\left[T^{-1}\right]=\left[M{L}^2{T}^{-1}\right]$

So, here we can see that both the Planck's constant and Angular momentum have the same dimensions.