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21. A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average K.E. of helium atoms is

(a)  Halved                                       (b)  Unchanged

(c)  Doubled                                    (d)  Increased by factor √2

Answer-c

(16)

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