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16: Light and the Sun

Last updated

Apr 1, 2025
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- 15.5: Sun – Earth Relationship- The Seasons
- 16.1: Electromagnetic Spectrum

Lumen Learning
Lumen Learning

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16.1: Electromagnetic Spectrum
16.2: Doppler Effect
This page explains the Doppler effect, introduced by Christian Doppler in 1842, describing how the frequency of waves changes due to the relative motion between the observer and source. It is notably observed in sound, as with sirens, where frequency increases when approaching and decreases when moving away.
16.3: Telescopes
This page covers the evolution of astronomical observations, from Galileo's discoveries supporting the Copernican model to modern telescopes that utilize the electromagnetic spectrum for detailed analysis of celestial objects. It details different telescope types—refractors, reflectors, and space telescopes—highlighting advancements in technology that enhance our understanding of the universe.
16.4: Nuclear Fusion
This page discusses the Sun as Earth's main energy source, producing a small fraction of the energy created by stars via nuclear fusion. It explains that hydrogen fuses into helium in stars, releasing energy that opposes gravity. This energy radiates as electromagnetic radiation. Additionally, it mentions how particle accelerators replicate stellar fusion by colliding subatomic particles at high energies, simulating conditions in stars and the early universe.

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