A) 1.4
B) 2.0
C) 2.8
D) 4.0
Correct Answer: A
Solution :
Average velocity of a gaseous molecule \[=\sqrt{\frac{8RT}{\pi M}}\] If the absolute temperature is doubled, then new Average velocity becomes \[\sqrt{\frac{8R.2T}{\pi M}}\] New average velocity \[=\sqrt{2}.\sqrt{\frac{8RT}{\pi M}}\] New average velocity \[=1.4\times \]Original average velocity. Hence, the correct option is [a].
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