Per15_over - Preview of Period 15: Energy in Nature 15.1...

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Preview of Period 15: Energy in Nature 15.1 The Earth-Sun System How much and what kind of energy does the Earth receive from the Sun? 15.2 The Earth’s Atmosphere What is the composition of the atmosphere? 15.3 Energy Balance of the Earth How does energy absorbed by the Earth compare to the energy emitted by the Earth? What causes the differences in the amounts of energy striking different regions of the Earth? What causes the seasons? 15.4 Water and Wind Cycles What is the water cycle? What causes local and global wind patterns? 15-1
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The Sun produces 3.90 x 10 26 watts of energy. This energy is produced by nuclear fusion : In the Sun’s core, protons and neutrons fuse into atoms of helium During fusion, photons of electromagnetic energy are given off. The photons travel to the surface of the Sun and are radiated into space. A very high activation energy is needed for nuclear fusion – the Sun’s core is 16,000,000 o C. (The surface temperature of the Sun is 6,000
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

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Per15_over - Preview of Period 15: Energy in Nature 15.1...

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