Which statement about the speed of light is true? a. the speed of light is faster for em waves traveling through a medium. b. no object or em wave can move faster than the speed of light in a vacuum. c. the speed of light changes depending on the motion of the source. d. energy, frequency, and wavelength all affect the speed of light.

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.