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# Intensity proportional to Amplitude squared watch

1. If intensity is proportional to amplitude squared, why is it that when intensity doubles , amplitude increases by a factor of root 2? I only understand that if amplitude doubles, intensity increases by a factor of 4
2. (Original post by scientific222)
If intensity is proportional to amplitude squared, why is it that when intensity doubles , amplitude increases by a factor of root 2? I only understand that if amplitude doubles, intensity increases by a factor of 4
try substituting things into kA^2=I, or aby other square relationship (sqrt2)^2=2...

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Updated: May 19, 2013
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