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How thick must granite walls be to isolate monks?
Part of a monastic order's lifestyle involves a ring of twelve cells — one per month of the 372-day year, each with a certain spiritual function. A single tunnel outfitted as an acoustic anechoic ...
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9
votes
2
answers
564
views
How do I determine the physical size of a quartz crystal of a given shape and vibrational mode needed to approximate a specific resonant frequency?
So, one of my D&D characters has a cut/relief-carved quartz crystal amulet (medallion shaped) that's both an arcane focus (crystal) and a holy symbol (amulet), and I thought it would be a good ...
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