Question

question 2 of 10
which two characteristics make electromagnetic waves effective in communication?
a. they carry more energy than visible light.
b. they do not require a medium to carry information.
c. they carry information very quickly.
d. they move faster through matter than through space.

Explanation:

Electromagnetic waves can travel through a vacuum (no medium), which is crucial for communication over long distances (e.g., space communication). Also, they travel at the speed of light (\(c = 3\times10^{8}\ m/s\) in vacuum), allowing for rapid information transfer. Option A is incorrect as not all electromagnetic waves carry more energy than visible light (e.g., radio waves have less energy). Option D is incorrect because electromagnetic waves move slower through matter (due to interactions with particles) than through space.

Answer:

B. They do not require a medium to carry information.
C. They carry information very quickly.