Removing Vascular Lesions a pulsed dye laser emits light of wavelength 585nm in 450-s pulses. Because this

Question:

Removing Vascular Lesions a pulsed dye laser emits light of wavelength 585nm in 450-µs pulses. Because this wavelength is strongly absorbed by the hemoglobin in the blood, the method is especially effective for removing various types of blemishes due to blood, such as port-wine-colored birth-marks. To get a reasonable estimate of the power required for such laser surgery, we can model the blood as having the same specific heat and heat of vaporization as water (4190J/kg · K,2.256 x 106 J/kg). Suppose that each pulse must remove 2.0µg of blood by evaporating it, starting at 33°C.
(a) How much energy must each pulse deliver to the blemish?
(b) What must be the power output of this laser?
(c) How many photons does each pulse deliver to the blemish?