A 24 X $10^{14}$ Hz Laser Emits a 3 $0.65 \mathrm {~J} / \mathrm { m } ^ { 3 }$

Multiple Choice

A 2.4 x $10^{14}$ Hz laser emits a 3.5-μs pulse that is 5.0 mm in diameter.The average energy density in the beam is $0.65 \mathrm {~J} / \mathrm { m } ^ { 3 }$ What average power is emitted by this laser? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

A) 3.8 kW
B) 7.7 kW
C) 12 kW
D) 15 kW
E) 19 kW