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