College Physics
College Physics
10th Edition
ISBN: 9781285737027
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 28, Problem 48AP

(a)

To determine

The physical length of the pulse as it travels through space.

(b)

To determine

The number of photon.

(c)

To determine

The number of photon per cubic millimeter.

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A pulsed ruby laser emits light at 694.3 nm. For a 14.7-ps pulse containing 3.40 J of energy, find the following. (a) the physical length of the pulse as it travels through space  _________________mm(b) the number of photons in it__________________ photons(c) If the beam has a circular cross section 0.600 cm in diameter, find the number of photons per cubic millimeter. _______________photons/mm3
A pulsed ruby laser emits light at 694.3 nm. For a 14.0-ps pulse containing 3.00 J of energy, find (a) the physical length of the pulse as it travels through space and (b) the number of photons in it. (c) Assuming that the beam has acircular cross-section of 0.600 cm diameter, find the number of photons per cubic millimeter.
An AM radio station broadcasts an electromagnetic wave with a frequency of 876 kHz, whereas an FM station broadcasts an electromagnetic wave with a frequency of 97.8 MHz. How many AM photons are needed to have a total energy equal to that of one FM photon?
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