COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 13, Problem 12QAP
To determine
Concept of interference to explain car radio reception signals
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Problem 1.
A geostationary satellite is located 36,000 kilo-
meters (km) away from the surface of the Earth. Once a minute it takes a
digital picture and transmits the data to a base station on Earth. The rate
of transmission is 10 Mbps and the propogation speed is 3.0 × 108 m/s. You
may assume the actual time required to take the picture is negligible.
a. What is the propagation delay of the link?
b. The bandwidth-delay product is defined to be Rxdprop where dprop is
the propagation delay. Calculate the bandwidth-delay product Rxdprop
where deprop is the propagation delay.
c. Let x denote the size of the picture in bits. What is the minimum
value for x so that the satellite is continuously transmitting data over
the link?
Submarine detection helicopters are fitted with transmitters which send out sound waves. The reflected signals identify the location of the submarines. Explain why it is common for this transmitter to be suspended from the helicopter by a wire so that it is under water.
Electromagnetic waves, which include light, consist of vibrations of electric and magnetic fields, and they all travel at the speed of light, 3.00×108 m/s
Part A: Sunburn (and skin cancer) is caused by ultraviolet light waves having a frequency of around 1.02×10^16 Hz. What is their wavelength?
Part B: It has been suggested that extraterrestrial civilizations (if they exist) might try to communicate by using electromagnetic waves having the same frequency as that given off by the spin flip of the electron in hydrogen, which is 1.43 GHz. To what wavelength should we tune our telescopes in order to search for such signals?
Part C: Microwave ovens cook food with electromagnetic waves of frequency around 2.45 GHz. What wavelength do these waves have?
Chapter 13 Solutions
COLLEGE PHYSICS
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