Q1. Radio amateurs are permitted to communicate on the 20-meter band. What frequency of radio waves corresponds to a wavelength of 10 meters? The speed of radio waves is 3 x 108 m/s.
Q2. A ball is thrown vertically upward with a speed of 1.63m/s from a point 4.21m above the ground. What is the time at which it will reach the ground?
Q3. A conducting shell, of inner radius a and outer radius b, has a total charge +Q. A point charge -3Q is positioned at the center of the shell. (a) Find an electric field in all space. (b) Find the charge on the inner and outer surface of the shell.