The Sun
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
Student preview
35 questions
Show all answers
1.
FLASHCARD QUESTION
Front
Light-year Noun
[lite-yeer]
Back
Light-year
The distance light travels in a vacuum in one year, a unit used for measuring vast astronomical distances.
Example: This diagram shows a light-year is a unit used to measure the vast distance between stars, like the 4.2 light-year distance from our Sun to Proxima Centauri.
2.
FLASHCARD QUESTION
Front
Luminosity Noun
[loo-mi-nos-i-tee]
Back
Luminosity
The total intrinsic amount of energy a star or other celestial object radiates per unit of time.
Example: The Sun, a star, has high luminosity, meaning it emits a large amount of energy as light and heat, which travels through space to Earth.
3.
FLASHCARD QUESTION
Front
Electromagnetic radiation Noun
[eh-lek-tro-mag-net-ik ray-dee-ay-shun]
Back
Electromagnetic radiation
A form of energy propagated as waves, including a spectrum of visible light, gamma rays, and radio waves.
Example: This diagram shows the electromagnetic spectrum, a range of energy waves from high-energy gamma rays to low-energy radio waves, including the visible light we see.
4.
FLASHCARD QUESTION
Front
Intensity Noun
[in-ten-si-tee]
Back
Intensity
The measure of radiation's power per unit area, which diminishes with the square of the distance from its source.
Example: Energy from a source like the Sun spreads out as it travels; the same amount of energy covers a larger area, so its intensity decreases with distance.
5.
FLASHCARD QUESTION
Front
Nuclear fusion Noun
[noo-klee-er fyoo-zhun]
Back
Nuclear fusion
A nuclear reaction where atomic nuclei combine to form heavier nuclei, releasing a tremendous amount of energy.
Example: Two small atomic nuclei, Hydrogen-1 and Hydrogen-2, combine (fuse) to form a larger nucleus, Helium-3, releasing a large amount of energy.
6.
FLASHCARD QUESTION
Front
Combustion Noun
[kom-bus-chun]
Back
Combustion
A rapid chemical reaction between a substance and an oxidant, usually oxygen, to produce heat and light.
Example: This diagram shows combustion, a chemical reaction where a fuel (candle wax) reacts with oxygen (O₂) to produce heat, light, carbon dioxide (CO₂), and water (H₂O).
7.
FLASHCARD QUESTION
Front
Proton-proton chain Noun
[pro-ton pro-ton chayn]
Back
Proton-proton chain
The main sequence of nuclear fusion steps by which stars like the Sun convert hydrogen into helium, releasing energy.
Example: This diagram shows how the Sun creates energy by fusing hydrogen nuclei (protons) into one helium nucleus through a multi-step process.
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