Compact High Power Lasers Can Produce

Compact high-power lasers can produce a 2.00-J light pulse of duration 100 fs, focused to a spot 1 +m in diameter. (See Mourou and Umstader, “Extreme Light,” Scientific American, May 2002, page 81.) The electric field in the light accelerates electrons in the target material to near the speed of light.
(a) What is the average power of the laser during the pulse?
(b) How many electrons can be accelerated to 0.999 9c if 0.0100% of the pulse energy is converted into energy of electron motion?

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