【題目】下列關于聲音的產(chǎn)生和傳播說法正確的是（ ）

A．物體不振動也可以發(fā)出聲音

B．空氣不能充當傳播聲音的介質

C．聲音在真空中的傳播速度為340m/s

D．音調與聲源物體振動的快慢有關

【答案】D

【解析】

試題分析：聲音是發(fā)聲體振動產(chǎn)生的，一切發(fā)聲的物體都在振動；

聲音的傳播需要介質，它既可以在氣體中傳播，也可以在固體和液體中傳播；

聲音的高低叫音調，音調與發(fā)聲體振動的快慢有關，振動越快音調越高．

解：

A、聲音是發(fā)聲體振動產(chǎn)生的，物體不振動不能發(fā)出聲音，此選項錯誤；

B、固體、液體和氣體都可以作為聲音傳播的介質，聲音可以在空氣中傳播，此選項錯誤；

C、聲音傳播需要介質，真空不能傳聲，此選項錯誤；

D、音調與聲源振動的快慢有關，振動越快音調越高，此選項正確．

故選D．

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