Echoes, sounds that are repeated or reverberate as a result of waves reflected back to the listener, occur in several physical systems. In physics research, echoes are typically used to eliminate the effects of dephasing caused by a system's interactions with the environment, as well as to unveil the inherent properties of certain objects.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/2Szpndf
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