Two gases are at absolute temperatures 300 K and 350 K respectively. The ratio of average kinetic energy of their molecules is

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6 : 7

36 : 49

7 : 6

343 : 216

answer is A.

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Detailed Solution

From the relation,KE¯=32kT⇒KE)¯1(KE¯)2=T1T2Given:T1=300K,T2=350K⇒(KE)¯1(KE¯)2=300350=67