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JEE Mains · Physics · STD 11 - 12 . kinetic theory of gases

एक गैस के अणुओं का संख्या घनत्व मूल बिन्दु से दूरी \(r\) पर निम्न ढंग से निर्भर है, \(n ( r )= n _{0} e ^{-\alpha r^{4}}\) । तो इस गैस के अणुओं की कुल संख्या किसके समानुपाती होगी।

  1. A \({n_0}{\alpha ^{ - 3/4}}\)
  2. B \({n_0}{\alpha ^{ - 3}}\)
  3. C \({n_0}{\alpha ^{ 1/4}}\)
  4. D \(\sqrt {{n_0}} {\alpha ^{1/2}}\)
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Answer & Solution

Correct Answer

(A) \({n_0}{\alpha ^{ - 3/4}}\)

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Detailed explanation

Given number density of molecules of gas as a function of \(r\) is \(n(r)=n_{0} e^{-a r^{4}}\) Total number of molecule \(=\int_{0}^{\infty} n(r) \mathrm{d} V=\int_{0}^{\infty} n_{0} e^{-\alpha x^{4}} 4 \pi r^{2} d r\) Number of molecules is proportional to…
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