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HYPOTHESIS I hypothesize that all of the materials listed in the previous slide will decrease WiFi signal strengths, but the glass will have the least effect. Glass will have the least effect on the WiFi signal because it allows the low frequency light to pass through. I think that the metal door will have the greatest effect on the signal because it does not let as much light energy through. What materials reflect signals? What materials absorb signals?
Wood, plaster, cinder blocks, and glass don't interfere much, but brick, stone, and water (like a giant fish tank) can block a Wi-Fi signal more. The materials that really block Wi-Fi signals are ceramic, concrete, metal, and mirrors, which reflect visible light and radio waves alike (. Wi-Fi Versus Your Walls.