Answer:
C
Explanation:
Generally, the speed of light slows down when passing through a medium that is not a vacuum. This is not always the case, but I will be ignoring the rare/exotic exceptions. Light has a harder time traveling through solids and liquids than it does with gases.
The volume dial is acting as a voltage divider or a variable resistor.
Answer:
D all of the above
Explanation:
electricity moves easily through all of them and none of them prevent the flow of electricity
One is their traits and their characterists that they have in common