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9. The root mean square velocity of the molecules in a sample of helium is 5/7th that of the molecules in a sample of hydrogen. If the temperature of hydrogen sample is 0°C, then the temperature of the helium sample is about

(a) 0°C                                     (b) 0 K

(c)   273°C                                (d)  100°C

Answer-a

(4)

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