What is the moon?

The moon can be heard by screaming in an empty room or in a tunnel. The end of your phrase will repeat itself in a few seconds. The moon is just the sound of your voice reflected from the walls. As a rule, you do not hear the echoes, because the sound of your voice can only be reflected from smooth, solid surfaces in the enclosed room. And even under such conditions the walls should be at least 17 m away from you, since hearing the moon can be no earlier than after 0,1s after the sound is formed.

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