question_answer

A given mass of a gas is allowed to expand freely until its volume becomes double. If \[{{c}_{b}}\], and \[{{c}_{a}}\]are the velocities of sound in the gas before and after expansion respectively then \[{{c}_{a}}\] is equal to :

A) \[{{2}_{cb}}\]                                    

B) \[{{\sqrt{3}}_{cb}}\]       

C) \[{{\sqrt{2}}_{cb}}\]                                       

D) \[{{c}_{b}}\]