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Solved: CP BIO Removing Vascular Lesions. A pulsed dye
Chapter 38, Problem 33P(choose chapter or problem)
Problem 33P
CP BIO Removing Vascular Lesions. A pulsed dye laser emits light of wavelength 585 nm 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 birthmarks. 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 (4190 J / kg ⋅ K, 2.256 × 106 J / kg). Suppose that each pulse must remove 2.0 μg of blood by evaporating it, starting at 33oC. (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?
Questions & Answers
QUESTION:
Problem 33P
CP BIO Removing Vascular Lesions. A pulsed dye laser emits light of wavelength 585 nm 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 birthmarks. 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 (4190 J / kg ⋅ K, 2.256 × 106 J / kg). Suppose that each pulse must remove 2.0 μg of blood by evaporating it, starting at 33oC. (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?
ANSWER:
Solution 33P
Step 1
