56. A given mass of a gas is allowed to expand freely until its volume becomes double.
If Cb and Ca are the velocities of sound in this gas before and after expansion respectively, then Ca is equal to
(a) 2Cb (b) √2 Cb
(c) Cb (d) (1/√2) Cb
Answer-c
(5)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)