Laser beams are sometimes used to burn away cancerous tissue.

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What is the intensity, in watts per square meter, of a laser beam that is $90\mathrm{.}0\%$ absorbed by a $2\mathrm{.}15-$mm diameter spot of cancerous tissue and must deposit $475$J of energy to it in a time period of $4\mathrm{.}25$s$?$