Problem 8.14 in book: The ionosphere, which is the layer of atmosphere located in the region 50 to 500 km above the Earth, has a density of free electrons just like a metal. (a) If the free electron density is 106 electrons per cubic centimeter, determine the plasma frequency of the ionosphere in Hz. (b) A metal is transparent to radiation with frequencies higher than the free-electron plasma frequency (this is usually in the ultraviolet range), and reflecting at lower frequencies. Determine the wavelengths at which the ionosphere becomes transparent, and those at which it becomes reflecting. (c) Is it transparent to at least some radio waves
Answers: 2
Physics, 21.06.2019 19:30, queenpaige2015
Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .
Answers: 2
Physics, 22.06.2019 02:00, robert7248
An object has a weight of 500 on earth what is the mass of this object
Answers: 1
Physics, 22.06.2019 05:30, ninaaforever
Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.
Answers: 2
Physics, 23.06.2019 13:10, Imamdiallo18
How does changing the strength of the fork vibration affect the characteristics of the longitudinal wave? how does changing the frequency of the fork vibration affect the characteristics of the longitudinal wave?
Answers: 1
Problem 8.14 in book: The ionosphere, which is the layer of atmosphere located in the region 50 to 5...
History, 08.07.2019 00:30
Arts, 08.07.2019 00:30
Biology, 08.07.2019 00:30
Mathematics, 08.07.2019 00:30
History, 08.07.2019 00:30
Mathematics, 08.07.2019 00:30