The number density of molecules of a gas depends on their distance ‘r’ from the origin as, \({\rm{n}}\left( {\rm{r}} \right) = {{\rm{n}}_0}{{\rm{e}}^{ - {\rm{\alpha }}{{\rm{r}}^4}}}\). Then the total number of molecules is proportional to:

• A. n0 α-3/4
• B. \(\sqrt {{{\rm{n}}_0}} {{\rm{\alpha }}^{1/2}}\)
• C. n0 α1⁄4
• D. n0 α-3