Some birthmarks can be removed by exposure to 585 nm laser


Some birthmarks can be removed by exposure to 585 nm laser light. Pulses are strongly absorbed by hemoglobin in the capillaries in the birthmark, destroying them. A typical laser pulse lasts for 1.5 ms, and contains an energy of 7.0 J.

a. What is the power of the laser pulse?

b. How many photons are in each pulse?

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Physics: Some birthmarks can be removed by exposure to 585 nm laser
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