Physics For Scientists And Engineers With Modern Physics, 9th Edition, The Ohio State University
9th Edition
ISBN: 9781305372337
Author: Raymond A. Serway | John W. Jewett
Publisher: Cengage Learning
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Chapter 34, Problem 29P
To determine
The average magnitude of the poynting vector.
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What is the average magnitude of the Poynting vector 9.00 mi from a radio transmitter broadcasting isotropically (equally in all
directions) with an average power of 300 kW?
HW/m2
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An AM radio transmitter broadcasts 54.0 kW of power uniformly in all directions.
(a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by
the atmosphere or other objects, what is the intensity (in W/m2) 26.0 km away? (Hint: Half the power will be spread
over the area of a hemisphere.)
W/m2
(b) What is the maximum electric field strength (in V/m) at this distance?
V/m
A satellite in geostationary orbit is used to transmit data via electromagnetic radiation. The satellite is at a height of 35,000 kmkm above the surface of the earth, and we assume it has an isotropic power output of 1.0 kWkW (although, in practice, satellite antennas transmit signals that are less powerful but more directional).
Reception devices pick up the variation in the electric field vector of the electromagnetic wave sent out by the satellite. Given the satellite specifications listed in the problem introduction, what is the amplitude of the electric field vector of the satellite broadcast as measured at the surface of the earth?
Chapter 34 Solutions
Physics For Scientists And Engineers With Modern Physics, 9th Edition, The Ohio State University
Ch. 34.1 - Prob. 34.1QQCh. 34.3 - What is the phase difference between the...Ch. 34.3 - Prob. 34.3QQCh. 34.5 - Prob. 34.4QQCh. 34.6 - Prob. 34.5QQCh. 34.7 - Prob. 34.6QQCh. 34.7 - Prob. 34.7QQCh. 34 - Prob. 1OQCh. 34 - Prob. 2OQCh. 34 - Prob. 3OQ
Ch. 34 - Prob. 4OQCh. 34 - Prob. 5OQCh. 34 - Prob. 6OQCh. 34 - Prob. 7OQCh. 34 - Prob. 8OQCh. 34 - Prob. 9OQCh. 34 - Prob. 10OQCh. 34 - Prob. 11OQCh. 34 - Prob. 1CQCh. 34 - Prob. 2CQCh. 34 - Prob. 3CQCh. 34 - Prob. 4CQCh. 34 - Prob. 5CQCh. 34 - Prob. 6CQCh. 34 - Prob. 7CQCh. 34 - Do Maxwells equations allow for the existence of...Ch. 34 - Prob. 9CQCh. 34 - Prob. 10CQCh. 34 - Prob. 11CQCh. 34 - Prob. 12CQCh. 34 - Prob. 13CQCh. 34 - Prob. 1PCh. 34 - Prob. 2PCh. 34 - Prob. 3PCh. 34 - Prob. 4PCh. 34 - Prob. 5PCh. 34 - Prob. 6PCh. 34 - Prob. 7PCh. 34 - Prob. 8PCh. 34 - The distance to the North Star, Polaris, is...Ch. 34 - Prob. 10PCh. 34 - Prob. 11PCh. 34 - Prob. 12PCh. 34 - Prob. 13PCh. 34 - Prob. 14PCh. 34 - Prob. 15PCh. 34 - Prob. 16PCh. 34 - Prob. 17PCh. 34 - Prob. 18PCh. 34 - Prob. 19PCh. 34 - Prob. 20PCh. 34 - If the intensity of sunlight at the Earths surface...Ch. 34 - Prob. 22PCh. 34 - Prob. 23PCh. 34 - Prob. 24PCh. 34 - Prob. 25PCh. 34 - Review. Model the electromagnetic wave in a...Ch. 34 - Prob. 27PCh. 34 - Prob. 28PCh. 34 - Prob. 29PCh. 34 - Prob. 30PCh. 34 - Prob. 31PCh. 34 - Prob. 32PCh. 34 - Prob. 33PCh. 34 - Prob. 34PCh. 34 - Prob. 35PCh. 34 - Prob. 36PCh. 34 - Prob. 37PCh. 34 - Prob. 38PCh. 34 - Prob. 39PCh. 34 - The intensity of sunlight at the Earths distance...Ch. 34 - Prob. 41PCh. 34 - Prob. 42PCh. 34 - Prob. 43PCh. 34 - Extremely low-frequency (ELF) waves that can...Ch. 34 - Prob. 45PCh. 34 - A large, flat sheet carries a uniformly...Ch. 34 - Prob. 47PCh. 34 - Prob. 48PCh. 34 - Prob. 49PCh. 34 - Prob. 50PCh. 34 - Prob. 51PCh. 34 - Prob. 52PCh. 34 - Prob. 53PCh. 34 - Prob. 54APCh. 34 - Prob. 55APCh. 34 - Prob. 56APCh. 34 - Prob. 57APCh. 34 - Prob. 58APCh. 34 - One goal of the Russian space program is to...Ch. 34 - Prob. 60APCh. 34 - Prob. 61APCh. 34 - Prob. 62APCh. 34 - Prob. 63APCh. 34 - Prob. 64APCh. 34 - Prob. 65APCh. 34 - Prob. 66APCh. 34 - Prob. 67APCh. 34 - Prob. 68APCh. 34 - Prob. 69APCh. 34 - Prob. 70APCh. 34 - Prob. 71APCh. 34 - Prob. 72APCh. 34 - Prob. 73APCh. 34 - Prob. 74APCh. 34 - Prob. 75APCh. 34 - Prob. 76CPCh. 34 - Prob. 77CPCh. 34 - Prob. 78CPCh. 34 - Prob. 79CP
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- A plane electromagnetic wave travels northward. At one instant, its electric field has a magnitude of 6.0 V/m and points eastward. What are the magnitude and direction of the magnetic field at this instant?arrow_forwardWhy is t1 radiation pressure of an electromagnetic wave on a perfectly reflecting surface twice as large as the pressure on a perfectly absorbing surface?arrow_forwardSuppose the maximum safe intensity of microwaves for human exposure is taken to be 1,00 W/m2. (a) If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection, (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modem ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)arrow_forward
- Suppose the magnetic field of an electromagnetic wave is given by B = (1.5 1010) sin (kx t) T. a. What is the maximum energy density of the magnetic field of this wave? b. What is maximum energy density of the electric field?arrow_forwardA radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?arrow_forwardIf the electric field of an electromagnetic wave is oscillating along the z-axis and the magnetic field is oscillating along the x-axis, in what possible direction is the wave traveling?arrow_forward
- Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.00W/m2. (a) If a radar unit leaks 10.0W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)arrow_forwardAn AM radio transmitter broadcasts 46.0 kW of power uniformly in all directions. Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity (in W/m2) 30.0 km away? What is the maximum electric field strength (in V/m) at this distance?arrow_forwardSuppose the maximum safe average intensity of microwaves for human exposure is taken to be 1.00 W/m2. If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away, rmin- must you be to be exposed to an average intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. Imin What is the maximum electric field strength E, at this distance? The permittivity of free space is €o = 8.854 × 10-12 C²/(N-m²). The speed of light is c = 3.00 x 108 m/s. Eo V/m Note: Early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.arrow_forward
- Assume (unrealistically) that a TV station acts as a point source broadcasting isotropically at 1.0 MW.What is the intensity of the transmitted signal reaching Proxima Centauri, the star nearest our solar system, 4.3 ly away? (An alien civilization at that distance might be able to watch X Files.) A light-year (ly) is the distance light travels in one year.arrow_forwardCalculate the peak electric and magnetic fields 32.1 km from a 1.0MW radio station, assuming that it radiates electromagnetic waves as an isotropic point source.arrow_forwardA 4.25 m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.5 μV/m . (a) What is the intensity of this wave in W/m2? (b) What is the power received by the antenna in W? (c) If the orbiting satellite broadcasts uniformly over an area of 1.50 × 1013 m2 (a large fraction of North America), how much power does it radiate in W?arrow_forward
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