試題詳解

54. Two different gases of similar mass density at room temperature react differently as the pressure is varied. Specifically, as the external pressure is raised from l atm to 1.01 atm, the volume of gas A is reduced by 0.1% while the volume of gas B is reduced by 0.2%. Which of the following statements is true?
(A) The sound speed of gas A is faster.
(B) Low frequency sound waves travel faster than the high frequency ones in
(C) Low frequency sound waves travel slower than the high frequency ones in gas A.
(D) For the same sound source of frequency f, the frequency changes more as it enters gas B.
(E) As we reduce the pressure, the volume of the gas does not al ways increase. gas A.