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
Correct Answer:
Verified
Correct Answer:
Verified
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