Study Hall: Sit in assigned seats, working on something quietly (Quiz & homework due tomorrow) .

Study Hall: Sit in assigned seats, working on something quietly (Quiz & homework due tomorrow). Get out your new interactive notebook!

Warm Up (2 minutes) Date Nov 14, 2013Draw a picture that illustrates ‘infrared’ and ‘ultraviolet’ radiation from the sun

Share with the Class? • Volunteers?

Announcements • Homework #1 and #2 are due tomorrow • Quiz tomorrow on electromagnetic spectrum • Notebooks will be checked tomorrow during the quiz (foldable and all station work)

Today! • You will complete stations #2, #3, and #5 during class today • If you finish, you may use the remaining time to complete your homework and / or study for tomorrow’s

Details of the Stations…. • Station #1 Frayer diagram vocabulary exercise using Ipads(If not completed, you must finish using the textbook) • Station #2 Rainbows and Visible Light with illustration • Station #3 “Sunscreen” article with questions • Station #5 Venn diagram activity • Station #4 Homework: Letter to President Obama and research on microwave ovens

Which station first? • Each table will receive a number (2, 3, or 5) • You will start with the station that matches your number • Any Questions – today Or tomorrow’s quiz

Brain Pop Video • “Electromagnetic Spectrum”

NASA website • Electromagnetic spectrum

Explanation:TVs use Radio Waves • The antennae on your television set receives signals in the form of electromagnetic (radio) waves which are broadcasted from TV stations or satellite companies • These companies have antennae or dishes which receive these radio waves • Signals are then sent through cables to your house and you can watch TV!

Cell Phones use Radio Waves • Your cell phone sends a radio wave out when you may a call or send a text • The radio wave goes in all directions until it hits a nearby cell tower • The cell tower will then send a radio wave to the person you want to call or text

Radio Telescopes • Radio telescopes are dishes made out of conducting metal that reflect radio waves to a focus point. • Because radio waves are so large, radio telescopes must be extremely large • Radio astronomers often combine receiving dishes into an array which focuses the energy to one point

Microwaves • Good for transmitting information from one place to another because they can pass through haze, light rain and snow, clouds, and smoke. • Used in remote sensing. These microwaves are used for radar like the doppler radar used in weather forecasts. Microwaves, used for radar, are just a few inches long.

Infrared • The heat that we feel from sunlight, a fire, a radiator or a warm sidewalk is infrared. • Infrared light is even used to heat food sometimes - special lamps that emit thermal infrared waves are often used in fast food restaurants!

Visible • Cones in our eyes are receivers for these tiny visible light waves. The Sun is a natural source for visible light waves and our eyes see the reflection of this sunlight off the objects around us. The color of an object that we see is the color of light reflected. All other colors are absorbed. • Light bulbs are another source of visible light waves. • Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. • When white light shines through a prism, the white light is broken apart into the colors of the visible light spectrum. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow.

Do you remember…… • What is wavelength? • Distance from crest to crest or trough to trough • What is frequency? • Number of waves passing a fixed point in 1 second

Do you remember…. • Visible light can interact with matter: • Absorbed • (taken in) • Transmitted • (travels through) • Refracted • (bent) • Reflected • (bounces off or is scattered)

UV • Some days, more ultraviolet waves get through our atmosphere. Scientists have developed a UV index to help people protect themselves from these harmful ultraviolet waves.

X Ray • The Earth's atmosphere is thick enough that virtually no X-rays are able to penetrate from outer space all the way to the Earth's surface. • When you get an X-ray taken at a hospital, X-ray sensitive film is put on one side of your body, and X-rays are shot through you. At a dentist, the film is put inside your mouth, on one side of your teeth, and X-rays are shot through your jaw, just like in this picture. It doesn't hurt at all - you can't feel X-rays. • Because your bones and teeth are dense and absorb more X-rays then your skin does, silhouettes of your bones or teeth are left on the X-ray film while your skin appears transparent. Metal absorbs even more X-rays - can you see the filling in the image of the tooth? • shadows of our bones to be projected onto and captured by film.

Study Hall: Sit in assigned seats, working on something quietly (Quiz & homework due tomorrow) .