1. Complete Warm-Up for April 9th. Work

with your shoulder partner first. Then

swap and compare answers with the rest

of your team.

2. The team with the most correct answers

are “King/Queen for the day” and the

rolling chairs.

3. Get your journal ready. Add one page of

guided notes to the next available page.

4. Time Limit: 8 minutes

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S8P5:

Students will explore the

wave nature of sound and

electromagnetic radiation.

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How can light and

sound be used as

tools?

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Echolocation is the use of reflected sound waves to determine distances or to locate objects. Some animals use echolocation to navigate and to find food. Examples of animals using echolocation would include bats, dolphins, porpoises, and whales.

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Sonar is a system that uses reflected sound waves to detect and locate objects under water.Some uses of sonar includes mapping the ocean floor and locating sunken ships

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Ultrasound waves can be sent into the human body. Different parts of the body reflect sound waves differently. The reflected waves are collected by a computer. The resulting images can be used to see the image a fetus, to look for gallstones, and to look for harmful tumors.

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1.Break up kidney stones or gall

stones

2.Clean jewelry, glassware, or

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Is this what you think of when I say the word „laser‟?

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ight

mplification of

timulated

mmision of

adiation

= strengthened

(atoms emit light when

exposed to

electromagnetic radiation)

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Characteristics of Laser light

•Laser light consists of light

waves that all have the same

wavelength or color.

(monochromatic)

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Characteristics of Laser light

The waves are coherent. (It is

“organized” -- each photon

moves in step with the others.)

All of the crests of the waves

align with one another.

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Production of Laser light

Lasers can be made from gases,

liquids, and solids. Laser

medium is placed in a tube with

a mirror at one end and a partial

mirror at the other end.

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Production of Laser light

The medium is “excited or

charged” by an electric current.

Excited atoms give off photons.

The photons bump into other

atoms which then give off

photons “in sync” with the

colliding photons.

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Production of Laser light

When photons travel back and

forth between the two mirrors

until a coherent beam passes

through the partial mirror.

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Cutting tool in industry

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Cutting tool in surgery – seals off blood vessels

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Remove cataracts and

repair the retina

Correct vision by

changing the shape of

the cornea

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Reading bar codes on packages

Reading a CD or a CD-ROM

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Create holograms

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Fiber Optics

Communications

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Light Tools: Other uses of EM

Waves

RADAR

Uses reflection

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Light Tools: Infrared detection

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Ultraviolet Waves Uses

1. disinfect medical equipment

2. detect forged bank notes

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2Work with your shoulder partner to

complete “Joking Around”. Your correct

answers will give you the response to

the joke.

Today‟s Closing Activity…