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A 4.4 × Hz laser emits a 2.1 μs pulse that is 5.0 mm in diameter.The energy density in the beam is How many wavelengths are there in the length of the beam? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)
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