What’s the most sound REFLECTIVE material?
In: Physics
The value you’re looking for in reference material is “acoustic impedance”, and you want it to be as high as possible. So, looking at some tables, highest I’ve found is tungsten
Vacuum
The waves cannot enter it, so they must reflect.
Of course, what you use to contain the vacuum will have its own properties, which will impact how the waves get reflected, and the thickness of that material will cause interference of certain wavelengths
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