help with part A,B,C & D please! show all work Homework #8 Problem 25.67 - MC 8

Question

help with part A,B,C & D please! show all work

Homework #8 Problem 25.67 - MC 8 of 10 > Part A Constants A LASIK vision correction system uses a laser that emits 10 ns-long pulses of light, each with 3.5 mJ of energy. The laser is focused to a 0.85 mm - diameter circle What is the average power of each laser pulse? Express your answer using three significant figures View Available Hint(s) Submit Part B What is the intensity of the laser light at the focus point? Express your answer using three significant figures View Available Hint(s) W/m2 Submit

Explanation / Answer

(A) P = Energy / time interval

P = (3.5 x 10^-3) / (10 x 10^-9)

P = 3.50 x 10^5 W

(B) I = P / (pi R^2)

I = (3.50 x 10^5) / ( pi (0.85 x 10^-3 / 2)^2)

I = 6.17 x 10^11 W/m^2

(C) I = E0^2 / (2 u0 c)

6.17 x 10^11 = E0^2 / (2 x 4pi x 10^-7 x 3 x 10^8)

E0 = 2.16 x 10^7 N/C

(D) B0 = E0/C = 0.072 T

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