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The ionosphere, which is the layer of atmosphere located in the region 50-500 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 hertz (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? (This is an important consideration for communication with satellites and spacecraft.)
Synchronous communications satellites are placed in a circular orbit that is 3.59 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
A physics professor demonstrates the Doppler Effect by tying a 600. Hz sound generator to a 1.00-meter-long rope and whirling it around his head in a horizontal circle at 100 rpm. What are the highest and lowest frequencies heard by a student in the ..
On a workday an average decibel level of the busy street is 89 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 30 every minute on a weekend, what is the decibel level of street.
Snell's Law and total internal reflection. Discovering Snell's Law with Bending Light 1.1.1. Total internal reflection or TIR. Problem solving using Snell's Law
How much time takes to release net radiant energy from body
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A circuit is constructed as shown to the right. The light bulbs have resistance of 5.0 Ω and the resistors are 10.0 Ω. The battery is 15.0 Ω. Rank the brightness of the bulbs A, B, X, Y, and Z from brightest to dentist.
suppose 2.5 kg of 32 deg c water is mixed with 9.3 kg of 65 deg c water. if no heat is lost in this system then what is
An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, how much later do the second and third sounds arrive
In an experiment of specific heat there are mixed 196 g of aluminum at 107°C with 52.3 g of water at 18.6 °C. Calculate the change in entropy of the system
If Mickey has a constant horizontal speed of 2.47 m/s while he is flying through the air, how high above his initial location in the gun does Mickey soar?
A river flows due south with a speed of 1.9m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.2m/s due east. What is the magnitude of his velocity relative to the earth
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