1. Starter Are these statements true? If not, correct them.
1) Mechanical waves transfer energy through a vacuum.
2) A wave is a disturbance that transfers energy.
3) Most EM waves are invisible but detectable.

2. Electromagnetic waves-a type of wave, such as a light wave or radio wave that does not require a medium to travel; a disturbance that transfers energy through a field.
Radiation-energy that travels across distances in the form of electromagnetic waves.

3. Read pps. C73-C77. On p. C77 do questions 1-6.

4. Starter Definitions 1) the transfer of energy by EM waves
2) a disturbance that transfers energy through a field
Terms
a) electromagnetic waves
b) radiation
c) medium
d) vacuum

5. Electromagnetic spectrum-the range of all electromagnetic frequencies, including the following types (from lowest to highest frequency): radio waves, microwaves, infrared light, visible light, ultraviolet light, visible light, x-rays, and gamma rays
Radio waves-the part of the electromagnetic spectrum that consists of waves with the lowest frequencies.
Microwaves-part of the electromagnetic spectrum that consists of waves with higher frequencies than radio waves, but lower frequencies than infrared waves.
Visible light-the part of the electromagnetic spectrum that consists of waves detectable by the human eye.
Infrared light-part of the electromagnetic spectrum that consists of waves with frequencies between those of microwaves and visible light.
Ultraviolet light-the part of the electromagnetic spectrum that consists of waves the frequencies higher than those of visible light and lower than those of x-rays.
X-rays-the part of the electromagnetic spectrum that consists of waves with high frequencies and high energies; electromagnetic waves with frequencies ranging from more 1016 hertz to more than 1021 hertz.
Gamma rays-part of the electromagnetic spectrum that consists of waves with the highest frequencies; electromagnetic waves with frequencies ranging from more that 1019 hertz to more than 1024 hertz.

6. Read pps. C79-C86. On p. C86 do questions 1-6

7. Starter
Predict what would happen if you kept a green plant in the dark for one month. Explain why.

8. Incandescence-the production of light by materials having high temperatures; light produced by as incandescent object.
Luminescence-the production of light without the high temperatures needed for incandescence.
Bioluminescence-the production of light by living organisms.
Fluorescence-a phenomenon in which a material absorbs electromagnetic radiation of one wavelength and gives off electromagnetic radiation of a different wavelength.

9. Read pps. C88-C92. On p. C92 do questions 1-6.

10. Starter Starter: Match each definition to the correct term.
Definition Term
1) the production of light without high temperatures a) bioluminescence
2) the production of light by living organisms b) incandescence
3) the production of light with high temperatures c) luminescence

11. Transmission-the passage of a wave through a medium.
Absorption-the disappearance of a wave into a medium. When a wave is absorbed, the energy transferred by the wave is converted into another form of energy, usually thermal energy.
Scattering-the spreading out of light rays in all directions as particles reflect and absorb the light.
Polarization-a way of filtering light so that all the waves vibrate in the same direction.
Prism-an optical tool that uses refraction to separate the different wavelength that make up white light.
Primary colors-three colors of light—red, green, and blue—that can be mixed to produce all possible colors.
Primary pigments-three colors of substances—cyan, yellow, and magenta—that can be mixed to produce all possible colors.

12. Read pps. C93-C99. On p. C99 do questions 1-6

13. Starter
What are the similarities and differences between mechanical waves and electromagnetic waves?

14. On p. C103 do questions 11-24