An experiment is made to measure the distance from Earth to the moon. A laser light with a wavelength of 432- nm is fired towards the moon, and such light is reflected by a mirror previously put in place on the moon. NASA scientists measure the difference in time between firing the laser, and receiving its light back on earth, and can deduce the distance. The mirror receives 0.28 W of power for a duration of 180-ps.

An experiment is made to measure the distance from Earth to the moon. A laser light with a wavelength of 432- nm is fired towards the moon, and such light is reflected by a mirror previously put in place on the moon. NASA scientists measure the difference in time between firing the laser, and receiving its light back on earth, and can deduce the distance. The mirror receives 0.28 W of power for a duration of 180-ps.

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

An experiment is made to measure the distance from
Earth to the moon. A laser light with a wavelength of 432-
nm is fired towards the moon, and such light is reflected
by a mirror previously put in place on the moon. NASA
scientists measure the difference in time between firing
the laser, and receiving its light back on earth, and can
deduce the distance. The mirror receives 0.28 W of
power for a duration of 180-ps.
Part A
How many photons were received by the mirror?
N =
Submit
15| ΑΣΦ
Request Answer
?

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