Which gas is used in filling electric bulbs? 

A parallel-plate capacitor is made of two flat metal plates pressed against a thin slab of dielectric material. The capacitor is connected to a power supply, and a potential difference of 85 V is applied to the plates. With the power supply disconnected, the dielectric material is removed and the potential difference between the plates is measured to be 475 V. What is the dielectric constant of the material that was initially used to fill the gap between the plats?

3:43 Mastering Assignments c Homework 5- Chapter 19 Traveling Electromagnetic Wave Learning Goal: To understand the formula representing a traveling electromagnetic wave. Light, radiant heat (infrared radiation), X rays, and radio waves are all examples of traveling electromagnetic waves. Electromagnetic waves comprise combinations of electric and magnetic fields that are mutually compatible in the sense that the changes in one generate the other The simplest form of a traveling electromagnetic wave is a plane wave. For a wave traveling in the x direction whose electric field is in the y direction, the electric and magnetic fields are given This wave is linearly polarized in the y direction. Part A In these formulas, it is usefull to understand which variables are parameters that specify the nature of the wave. The variables Eo and Bo are the felds of the electric and magnetic Choose the best answer to fill in the blank View Available Hint(s) Part B of the wave. The variable is called the Choose the best answer to fill in the blank. RequestAnswer Part C The variable k is caled the Choose the best answer to fill in the blank. Of the wave.