A 44 × $10^{14}$ Hz Laser Emits a 2 $0.24 \mathrm {~J} / \mathrm { m } ^ { 3 }$

A 4.4 × $10^{14}$ Hz laser emits a 2.1 μs pulse that is 5.0 mm in diameter.The energy density in the beam is $0.24 \mathrm {~J} / \mathrm { m } ^ { 3 }$ 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

Correct Answer:

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