Question

Determine the amount of energy carried in 2.0 m of a 4.6-mW He-Ne laser beam if the cross-sectional area of the beam is 4.1 × 10⁻⁶ m².

Group of answer choices

​1.0E–11 J

4.9E–12 J

3.1E–11 J

1.4E–10 J

6.1E–8 J

Answer 1

Use the speed of light and power and intensity to find the required energy after finding the energy density as shown below for the given laser beam

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