A Ruby Laser Beam (λ = 694

question 10

Multiple Choice

A ruby laser beam (λ = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?

• A) 500 m
• B) 250 m
• C) 120 m
• D) 1.0 km
• E) 2.7 km

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Definitions:

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