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    【题目】下列关于声音的产生和传播说法正确的是（ ）

    A．物体不振动也可以发出声音

    B．空气不能充当传播声音的介质

    C．声音在真空中的传播速度为340m/s

    D．音调与声源物体振动的快慢有关

    【答案】D

    【解析】

    试题分析：声音是发声体振动产生的，一切发声的物体都在振动；

    声音的传播需要介质，它既可以在气体中传播，也可以在固体和液体中传播；

    声音的高低叫音调，音调与发声体振动的快慢有关，振动越快音调越高．

    解：

    A、声音是发声体振动产生的，物体不振动不能发出声音，此选项错误；

    B、固体、液体和气体都可以作为声音传播的介质，声音可以在空气中传播，此选项错误；

    C、声音传播需要介质，真空不能传声，此选项错误；

    D、音调与声源振动的快慢有关，振动越快音调越高，此选项正确．

    故选D．

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