1. A heliumneon laser emits light of wavelength 632.8 nm and has a power output of 4...
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1. A helium–neon laser emits light of wavelength 632.8 nm and has a power output of 4 mW. How many photons are emitted per second by this laser?
2. The spiral galaxy in the Andromeda constellation is about 2 × 1019 km away from us. How many light-years is this?
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Related Book For
Fundamentals of Ethics for Scientists and Engineers
ISBN: 978-0195134889
1st Edition
Authors: Edmund G. Seebauer, Robert L. Barry
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