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NEET 2011
Exam
NEET
Year
2011
Subject
Chemistry
Chapter
States of Matter

NEET 2011 · Chemistry · States of Matter

By what factor does the average velocity of a gaseous molecule...

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

Options

  1. A2.8
  2. B4.0
  3. C1.4
  4. D2.0

Correct answer

C. 1.4

Step-by-step solution

Average velocity =8RTπM=\sqrt{\frac{8 R T}{\pi M}}∴Vav∝T or  (Vav)2(Vav)1=2TT=1.4\begin{aligned}& \therefore V_{a v} \propto \sqrt{T}\\ & \text{\text{ or } } \frac{\left(V_{a v}\right)_2}{\left(V_{a v}\right)_1}=\sqrt{\frac{2 T}{T}}=1.4 \end{aligned}$
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