The speed of a mechanical wave depends on the mechanical properties
of the medium through which the wave is traveling.
The speed of an electromagnetic wave depends on the electrical properties
of the medium through which the wave is traveling.
It's pretty well unanimous for choice <em>A</em> .
Answer:
Answers of the Both parts are in the following attachment
Explanation:
Answer: unintelligent people live in blissful ignorance smart people know what they don't know and they know how bad life really is
Explanation: personal experience