At what rate do photons emitted by a laser ((lambda=650 mathrm{~nm})) hit a wall (3.00 mathrm{~m}) from

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At what rate do photons emitted by a laser \((\lambda=650 \mathrm{~nm})\) hit a wall \(3.00 \mathrm{~m}\) from the laser if the power rating is \(6.00 \mathrm{~mW}\) ? What assumption must you make to solve this problem?

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