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Fav十万个为什么
为什么把耳朵贴在铁轨上能听到火车的声音？
把耳朵贴在铁轨上能听到火车的声音，主要是因为声音在固体中传播速度快且衰减少，铁轨作为固体介质能更有效地传递声音。
1、固体传声优势：声音在固体中的传播速度比在空气中快，铁轨作为钢铁制成的固体，能更快地传递声音。
2、传播距离远：声音在铁轨中传播时，能量衰减较空气中慢，因此能传播更远的距离，使远处火车的声音也能被听到。
3、声音损失小：相比空气，铁轨等固体介质对声音的吸收较少，声音在传播过程中损失较小，更容易被耳朵捕捉到。
总结：把耳朵贴在铁轨上能听到火车的声音，主要是因为声音在固体中传播速度快且衰减少，铁轨作为固体介质能更有效地传递声音。
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