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A 3.0-V incandescent flashlight bulb draws 0.25 A, converting about 1.0% of the dissipated power into light

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A 3.0-V incandescent flashlight bulb draws 0.25 A, converting about 1.0% of the dissipated power into light (λ ≈ 550 nm). If the beam has a cross-sectional area of 10 cm2 and is approximately cylindrical

(a) How many photons are emitted per second?

(b) How many photons occupy each meter of the beam?

(c) What is the flux density of the beam as it leaves the flashlight?

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P iV 02530 075 W This is the electrical power dissipated The power a...View the full answer


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Optics

Optics

ISBN: 978-0133977226

5th edition

Authors: Eugene Hecht

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