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Home Q & A Board Science-Related Homework Help Physics
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pgakui pgakui
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2 months ago

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 Erms of the beam?



▸

4.9 × 104 V/m



▸

2.5 × 103 V/m



▸

1.2 × 103 V/m



▸

1.9 × 102 V/m



▸

1.7 × 102 V/m

Textbook 
College Physics

College Physics


Edition: 5th
Author:
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wellsarwellsar
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