49. The root mean square speed of hydrogen molecules at 300 K is 1930 m/s. Then the root mean square speed of oxygen molecules at 900 K will be
(a) 1930√3 m/s (b) 836 m/s
(c) 643 m/s (d) 1930/√3 m/s
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a