A 5-MW Laser Pointer Has a Beam Diameter of 3

question 74

Multiple Choice

A 5-mW laser pointer has a beam diameter of 3 mm.What is the total electromagnetic energy in a 2.0 m length of this laser beam?

• A)2.3 * 10^-16 J
• B)4.7 * 10^-16 J
• C)1.7 * 10^-11 J
• D)3.3 * 10^-11 J
• E)5.0 * 10^-3 J

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