JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

The number density of molecules of a gas depends on their distance r from the origin as, $n (r) = n_{0} e^{- α r^{4}}$ . Then the total number of molecules is proportional to

A
$n_{0} α^{- 3/4}$
B
$n_{0} α^{\frac{1}{2}}$
C
$n_{0} α^{\frac{1}{4}}$
D
$n_{0} α^{- 3}$

Solution

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