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8. A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

 

(a)  Hydrogen                          (b)  Helium

(c)   Nitrogen                            (d)  Argon

Ans. d

(6)

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