Answered: The boy walked in the evening in the…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Quantum Physics

Section: Chapter Questions

Problem 23P

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The boy walked in the evening in the park with the flashlight with a power of 20 W . The flashlight bulb is monochromatic and emits photons with a wavelength 590 nm . When the boy came home, he took out a light bulb from the flashlight, connected it to the battery, and placed it in front of a sheet of paper with the dimensions 20cm×30cm at a distance of 1.2 m from it.

a) How many photons per second fall on a piece of paper? To complete the first step, you need to find the ratio A between the area of a sheet of paper and the surface area of a sphere with a radius of 1.2 m .

b) If you stand 17 mm from this bulb, how many photons enter each of your eyes per second? Assume your pupil is 5.0 mmmm in diameter and that the bulb radiates uniformly in all directions.

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