Question

practice 3: choose the best answer.

1. how does electromagnetic radiation travel?

a. electromagnetic radiation travels as a wave at the speed of light and requires no medium for travel
b. electromagnetic radiation travels as a wave at the speed of sound and requires no medium for travel
c. electromagnetic radiation travels as a wave at the speed of light and requires a dense medium for travel
d. electromagnetic radiation travels as a wave at the speed of sound and requires a dense medium for travel

Explanation:

Electromagnetic radiation is a form of energy that travels as waves. It moves at the speed of light (\(c = 3\times10^{8}\space m/s\)). Unlike mechanical waves (such as sound waves which require a medium like air, water, or solids to travel), electromagnetic radiation does not need a medium. This is because electromagnetic waves are composed of oscillating electric and magnetic fields that can propagate through a vacuum.

Answer:

A. Electromagnetic radiation travels as a wave at the speed of light and requires no medium for travel