What are electromagnetic (EM) waves?
Astronomy Test Review

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Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Electromagnetic waves are waves of energy that travel through space at the speed of light, consisting of oscillating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
2.
FLASHCARD QUESTION
Front
Which EM wave has a lower frequency than X-Ray and shorter wavelengths than Infrared?
Back
Ultraviolet (UV) waves.
3.
FLASHCARD QUESTION
Front
What is red shifting in astronomy?
Back
Red shifting is the phenomenon where light from distant galaxies is shifted towards the red end of the spectrum, indicating that the galaxies are moving away from us, which supports the theory of the expanding universe.
4.
FLASHCARD QUESTION
Front
True or False: We have telescopes that can study EM wavelengths the human eye cannot see.
Back
True.
5.
FLASHCARD QUESTION
Front
What direction do you go on an HR diagram to find the dimmest stars?
Back
Down.
6.
FLASHCARD QUESTION
Front
What element is found in all main sequence stars, which make up 90% of those in the universe?
Back
Hydrogen.
7.
FLASHCARD QUESTION
Front
What is the Big Bang theory?
Back
The Big Bang theory is the leading explanation for the origin of the universe, proposing that it began as a singularity approximately 13.8 billion years ago and has been expanding ever since.
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