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What about walls? And how would you target only one room in a hotel? Multiple intersecting beams?


This not possible with sound waves. EM yes because they work in magic extra-dimensional ether that no one has explained yet. But sound needs an uninterupted physical medium to propagate.


No ether, no magic, no extra dimensions, just radiation. Check out http://www.physlink.com/Education/AskExperts/ae175.cfm for an explanation of how it can pass through walls and https://en.wikipedia.org/wiki/Luminiferous_aether if you want to know why we know there isn't an aether/ether and how things work without it.




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