The position vector x for an electron moving with velocity much less than c in a plane monochromatic wave epsilon e_0 cos(omega t - kz) is determined by the equation of motion md^2 x/dt^2 = e epsilon e_0 cis (omega t - kz). show that the refractive index of an electron gas is given by eq. (3.14.13). assume that in the ionosphere the refractive index for 100-mhz radio waves is 0.90 and that the free electrons make the greatest contribution to the index. estimate the number density of electrons. why is the contribution of positively charged ions to the refractive index much smaller? choose an am and an fm radio station in your area and compare their frequencies to the plasma frequency of the ionosphere.

Bernie drove home from a vacation in 1.5 hours. he traveled a total distance of 60 miles. what was his average speed in miles per hour? a. 60 mph b. 90 mph c. 40 mph d. 55mph

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages