Please solve all parts. Thanks! MasteringPhysics: HW#5-Google Chrome Secure l ht

Question

Please solve all parts. Thanks!

MasteringPhysics: HW#5-Google Chrome Secure l https://session.masteringphysics.com/myct/itemView?assignmentProblemID-8741 5708&offsetsnext; HProblem 28.81 Remaoving vascular lesions e previous | 27 of 27 l relum to essignment Problem 28.61: Removing vascular lesions. Part A Apulsed dye lager ents light or wavelength 570 nm n 445 . pulses Because this uRelengt is strongly sbeorbed by the hemoglobin in the blood the rethod is especisly efective for amaving vanous typea cf bamiahes due to bicod auch as por-wine-oolored bithmarks. To gat s resson able estimate of fhe pover required for such laser surgery we can model the bood ss hawng tha sara specito heat and hut of vaporization aswanar l 4100 J/kK-K 2.2 6 x 1o" J /kg. Suppose ter each pulse must remove 200 of blood by evapor ing t taring 330 C. How much energy ma !on pulse deivertothe blemish? My answer Geu Part B Whst must be the power output of thie laser? My Anewers gau How many photons does each pusa diver to blamsh? photons My answer Geu Type here to search 6:03 PM 11/14/2017

Explanation / Answer

part(A):

energy E, whicheach pulse delivers to the blemish to remove 2.0ug of blood

={(2.0*10^-9)*(4190*(100-33)+2.26*10^6)}

E=5.08*10^3J

E=5.08J

part(B):

required power of the laser=(5.08*10^-3)/(445*(10^-6))

=11.41W.

part(C):

number N of photons does each pulse deliver to the blemish

=(5.08*10^-3)/(3.4*10^-19)

N=1.15*10^16.

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