College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Concept explainers

Compton effect
The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible ligh…
Recoil Velocity
The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.
Question

. If a 100-W lightbulb emits 3.0% of the input energy as
visible light (average wavelength 550 nm) uniformly in all
directions, estimate how many photons per second of
visible light will strike the pupil (4.0 mm diameter) of the
eye of an observer, (a) 1.0 m away, (b) 1.0 km away

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