(a) How many photons per second are emitted by a monochromatic light-bulb (( = 650 nm) that...

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(a) How many photons per second are emitted by a monochromatic light-bulb (( = 650 nm) that emits 45 W of power?
(b) If you stand 15 m from this bulb, how many photons enter each of your eyes per second? Assume your pupil is 5.0 mm in diameter and that the bulb radiates uniformly in all directions?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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