(a) Suppose you imbedded some free charge in a piece of glass. About how long would it take for the charge to flow to the surface?

  

(b) Silver is an excellent conductor, but it’s expensive. Suppose you were designing a microwave experiment to operate at a frequency of 10¹⁰ Hz. How thick would you make the silver coatings?

  

(c) Find the wavelength and propagation speed in copper for radio waves at 1 MHz. Compare the corresponding values in air (or vacuum).