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The number of particles crossing a unit ...

The number of particles crossing a unit area perpendicular to the `x - axis` in a unit time is given by `n = - D((n_(2) - n_(1))/( x_(2) - x_(1)))`, where `n_(1) and n_(2)` are the number of particles per unit volume at ` x = x_(1) and x_(2)` , respectively , and `D` is the diffusion constant. The dimensions of `D` are

A

`M^(@) LT^(3)`

B

`M^(@)L^(2)T^(-4)`

C

`M^(0)LT^(-2)`

D

`M^(0)L^(2)T^(-1)`

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The correct Answer is:
D
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