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A 20 W laser beam, with an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after ...

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A 20 W laser beam, with an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after ...

A 20 W laser beam, with an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m. What is the initial intensity of the beam?

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20 × 10⁶ W/m²

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6.4 × 10⁶ W/m²

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3.2 × 10⁶ W/m²

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2.0 × 10⁵ W/m²

▸

1.0 × 10⁵ W/m²

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College Physics

Edition: 5^th

Author: Giambattista

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this is exactly what I needed

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Helped a lot

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