light and the sun. objectives: students will be able to explain how the sun produces energy which is...
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Light and the sun
• Objectives: Students will be able to explain how the sun produces energy which is transferred to the Earth by radiation
Today’s agenda
• Quiz
• Notes
• Guided reading worksheets
• Outlining
Electromagnetic spectrum
Electromagnetic spectrum- the arrangement of energy waves according to their wavelengths and frequencies
Doppler effectThe doppler effect is
the change in wavelength of a wave that is emitted from a source that is moving away or toward an object
Doppler effect
Red shifts- when objects are moving away
Blue shifts- when objects are moving towards something
The sun
• It is 1 of 100 billion stars in the Milky Way Galaxy
Why does the sun shine?
Nuclear Fusion!!!
Nuclear Fusion
• The sun shines because it produces energy by nuclear fusion
• In the nuclear reaction, smaller atoms are fused together to make a larger one
• Lots of energy is released from nuclear fusion
• E = mc2
– E= energy
– M = mass
– C= speed of light
Nuclear Fission• The sun also produces
energy by nuclear fission.
• Nuclear fission is the splitting of large atoms into smaller ones
• The energy released from fission is less than that released from nuclear fusion
Guided reading worksheets
• Answer the two worksheets based on your reading from 24.1 and 24.3
• After you are done, you will hand the worksheets up front…make sure your name is on them!
• You will outline sections 24.1 and 24.3
• If you do not finish the outlines today, we will finish them tomorrow