如果一棵树倒在森林里，周围没有人听见，它会发出声音吗？(If a tree falls in the forest, and nobody is around to hear it, does it make a sound?)——欧美最伟大的哲学问题

如果一棵树倒在森林里，周围没有人听见，它会发出声音吗？(If a tree falls in the forest, and nobody is around to hear it, does it make a sound?)——欧美最伟大的哲学问题在《欧美最伟大的哲学问题》中排名第19名。 ...

如果一棵树倒在森林里周围没有人听见它会发出声音吗欧美最伟大的哲学问题在欧美最伟大的哲学问题中排名第19名。

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我们精选了部分网友观点：

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是的，当然有噪音。事实证明，噪音是由声波产生的。振动通过物体或材料时会产生一种形式的能量。声波是声音撞击材料或物体时产生的结果。声音的频率有很多级。人的耳朵能听到特定范围的声音频率。声音本身或声波也与音调、持续时间、响度有关，物体或物质的空间位置和音质。仅仅因为在某一时刻周围没有人能听到这个声音，这里的例子“如果一棵树倒在森林里……”并不意味着声波没有产生或者能量不存在

Yes of course there's a noise. It's proven that noise is produced by soundwaves. Vibrations produces a form of energy when they pass trough an object or material. Waves are the result when the sound hits the the materials or objects. There are many levels of frequency in sound. Ears of humans can hear a specific range of sound frequency. The sound itself or soundwaves are also related to pitch, duration, loudness, spatial locotion and the sonic texture of the object or material. Just because there's no one around to hear this sound at a given moment ( the example here " if a tree falls in the forest... " ) doesn't mean that the soundwaves aren't produced or that the energy is non-existence.

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当然会发出声音！所有移动的物体都会产生声波，人类会听到一些声音，有些则不会，而有些动物会听到人类听不到的声音。声波最简单的证明就是喷气式飞机飞行速度超过音速时听到的砰砰声

Of course it makes a sound! Everything that moves creates soundwaves ( humans will hear some sounds and some not while some animals will hear sounds that humans don't hear ). The easiest prove of the soundwaves is the bang you hear when a jetplane goes faster than the speed of sound ( the soundbarrier )

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我喜欢这样的问题。它让你的大脑运转起来，并引导你思考生活的其他方面。—英国女孩

I love questions such as this. It gets your brain working and leads you to think about other aspects of life. - Britgirl

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首先想想声音是从哪里来的

Think first of where sound comes from first.

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取决于人的傲慢

Depends on the arrogance of the person