Biology Forums - Study Force

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)
A) 9.2 × 108
B) 2.8 × 109
C) 2.8 × 108
D) 9.2 × 109
E) 2.8 × 1010

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