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Question: please show all work and equations thank you...

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(4 (a) Determine the amount of energy carried in 1.25 m of a 4.0-mW He-Ne Helium- Neon) laser beam if the cross-sectional area of the beam is 4.35 mm2. (b) Maximum energy for a neodymium-glass laser is 625 J for 1.25 nanosecond. If the cross-section of the laser beam is 0.75 cm2,what are the maximum values of the electric and magnetic fields? Please show all work and equations! Thank you!
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