Problem 24.06. A laser emits monochromatic light (light of a single frequency). A 5 mW (milliWatt) laser is enough to cause eye damage with an exposure of 1/100 of a second. (a) If the power of a laser is the energy per unit time, P = E/t, how much energy is emitted by a 5 mW laser in 1/100 seconds? (b) If the light of this laser is red with a wavelength of 700 nm, how many photons are emmitted in this flash of light to transmit the energy calculated in part a? (Hint: The total energy is the energy of a single photon of that wavelength times the number of photons).

Problem 24.06. A laser emits monochromatic light (light of a single frequency). A 5 mW (milliWatt) laser is enough to cause eye damage with an exposure of 1/100 of a second. (a) If the power of a laser is the energy per unit time, P = E/t, how much energy is emitted by a 5 mW laser in 1/100 seconds? (b) If the light of this laser is red with a wavelength of 700 nm, how many photons are emmitted in this flash of light to transmit the energy calculated in part a? (Hint: The total energy is the energy of a single photon of that wavelength times the number of photons).

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

Problem 24.06. A laser emits monochromatic light (light of a single frequency). A 5 mW
(milliWatt) laser is enough to cause eye damage with an exposure of 1/100 of a second. (a)
If the power of a laser is the energy per unit time, P = E/t, how much energy is emitted by
a 5 mW laser in 1/100 seconds? (b) If the light of this laser is red with a wavelength of 700
nm, how many photons are emmitted in this flash of light to transmit the energy calculated
in part a? (Hint: The total energy is the energy of a single photon of that wavelength times
the number of photons).

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