Question

The physical quantity that doesn’t have appropriate unit is

• A. Compressibility -- $N^{-1}m^2$
• B. Latent heat -- $J\,kg^{-1}$
• C. Intensity -- $Wm^{-2}$
• D. Energy density -- $Jm^{-2}$
• E. Impulse -- $Ns$

Hint:

Energy density is energy per volume ($J/m^3$), not per area.

Answer 1

The Correct Option is D

Concept:
• Check correct SI units

Step 1: Verify units
(A) Compressibility $\sim \frac{1}{Pressure} = N^{-1}m^2$ \checkmark
(B) Latent heat = $J/kg$ \checkmark
(C) Intensity = $W/m^2$ \checkmark
(D) Energy density should be $J/m^3$ $\times$
(E) Impulse = $Ns$ \checkmark Final Conclusion:
Option (D) is incorrect unit.