Question

The flux density of mass is defined as the amount of mass crossing unit area per unit time. The dimensions of this quantity is

• A. $\left[M L^{-2} T^{-1}\right]$
• B. $\left[M L^{2} T^{-1}\right]$
• C. $\left[M L T^{-1}\right]$
• D. $\left[M^{-1} L^{-2} T\right]$

Answer 1

Answer: (A)

Flux density of mass
$=\frac{\text { Amount of mass }}{\text { Area } \times \text { time }} $
$=\frac{[M]}{\left[L^{2}\right][T]} $
$=\left[M L^{-2} T^{-1}\right]$