Physics for Scientists and Engineers
Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 34, Problem 62P
To determine

The intensity of light.

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t study found that electrons that have energies between 3.15 eV and 20.9 eV can cause breaks in a DNA molecule ough they do not ionize the molecule. If a single photon were to transfer its energy to a single electron, what range wavelengths could cause DNA breaks? um wavelength: maximum wavelength: nm nr ich part of the electromagnetic spectrum does this light lie? nfrared
(a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced? 1.1679e32 X How does power relate to energy? Review the relationship between energy and frequency of a photon. photons/s (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 125 km. Assume no reflection from the ground or absorption by the air. 2.138e21 If there is no reflection by the ground, what fraction of the radiated power reaches the receiver? What portion of the spherical surface do you need to consider here? photons/(s · m2) Additienel Mete niel
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