9th Grade Radio Astronomy Quizzes , Questions & Answers

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Speed of Light Data: The Electromagnetic Waves Communication Quiz

How does a video reach a phone from across the globe? Data is converted into invisible waves that travel at the speed of light, carrying everything from text to high-definition movies. This electromagnetic waves communication...

Questions: 20 | Attempts: 14 | Last updated: Feb 13, 2026

Sample Question 1
Why are electromagnetic waves used rather than sound waves for long-distance digital communication in space?

They can travel through a vacuum.

They are louder than sound waves.

They require a liquid medium.

They travel slower than sound.

They are invisible to the eye.

Sample Question 2
In digital communication, what is the primary function of "binary code" (0s and 1s)?

To represent information as discrete pulses or states.

To make the signal travel faster.

To increase the weight of the signal.

To turn the waves into sound.

To prevent the wave from reflecting.

Sample Question 3
Digital signals are generally more reliable than analog signals over long distances because they can be more easily "cleaned" of noise.

True

False

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