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One of the weapons considered for the "Star Wars" antimissile system is a laser that could destroy ballistic missiles. When a high-power laser is used in the Earth's atmosphere, the electric field can ionize the air, turning it into a conducting plasma that reflects the laser light. In dry air at 0°C and 1 atm, electric breakdown occurs for fields with amplitudes above about 2.97 MV/m. (a) What laser beam intensity will produce such a field? W/m2 (b) At this maximum intensity, what power can be delivered in a cylindrical beam of diameter 5.10 mm?

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