 Skills and Objectives to be Taught:
Properties of Light By Cindy Grigg |
1 Light is one form of energy that travels in electromagnetic waves. This energy is both magnetic and electrical. 2 There are many different types of electromagnetic (EM) waves. Most of them cannot be seen by humans. Our eyes see only a small portion of EM waves called visible light. Visible light is made up of different colors. The colors are red, orange, yellow, green, blue, indigo, and violet. The colors are due to the different wavelengths of light. The longer the wavelength, the less energy the wave has. The shorter the wavelength, the more energy it has. The longest wavelength of visible light looks red to us. The shortest wavelength of visible light looks violet to us. 3 Here are some properties of light:Assignment=Explain in your journal what a wavelength is
Assignment=
Look up "photons" on the internet and explain about them in a few short sentences in your journal
7 Light travels "at the speed of light." This speed is about 186,000 miles per second (670 million miles per hour), or about 300,000 kilometers per second. The speed of light is sort of a galactic "speed limit." So far, nothing has been found that can travel faster than light.
6 Light travels in straight lines called rays.
Assignment=Use the internet to discover how the 1st person realized how fast light moves. Explain about in your journal.
ASSIGNMENT= Look up on the internet about the statement " Light can travel in a vacuum."
Find out exactly what that means and put your explanation in your journal.
9 Light can be absorbed. Absorbed light energy is converted into some other form, such as thermal or heat energy. You can test this by putting a piece of black construction paper and a piece of white construction paper on a sunny windowsill. Place a thermometer for measuring outdoor or room temperature under each piece of paper. Wait a few hours, and then check the two temperatures. The thermometer underneath the black paper should be hotter than the one under the white paper. This is the reason people tend to wear dark colors in the wintertime and white or light colors in the summer. Dark colors absorb light, helping us keep warmer in the winter. In the summer, light colors absorb little of the sun's energy, keeping us cooler.
Assignment= Please copy and then complete this graphic organizer about the absorption of light in your journal
10 Light can be reflected. If you shine light on a surface, some of that light will bounce off, or be reflected by, the surface. The law of reflection tells us that light will always be reflected by a surface at the same angle at which it hits the surface.
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Assignment= Please click this website , watch this video and take notes in your journal
http:/www.engineeringinteract.org/resources/alienattack/flash/concepts/reflectionseeingobjects.htm
Light can travel in a vacuum. A vacuum is empty space. There are no molecules of air or anything else in a vacuum. Like all forms of electromagnetic waves, light can travel through empty space, as well as through matter.
Assignment= Please look up on the internet what "Light can travel in a vacuum" means and wite it down in your journal.
11 Light can be refracted. Light always travels in straight lines. But when it passes from one medium into another, it changes direction slightly. Refraction occurs because light travels at different speeds through different materials. When light passes through air into water, for example, it slows down. The light rays are bent slightly. You can see this if you put a pencil into a half-glassful of water. The pencil looks bent or broken at the water line. This is due to refraction. Objects that we see get their color from the light they reflect. A green object looks green because it absorbs all other colors but reflects green.
Assignment= Please copy and then complete this graphic organizer about the refraction of light in your journal
Transparent materials allow light to be transmitted through them easily. 12 Light can be transmitted. Sometimes light passes through matter. This is called transmission. Light is transmitted through some matter more easily than through other kinds of matter. Light is transmitted through water, air, and glass very easily. These materials are said to be transparent.
Opaque matter does not transmit any light. You cannot see through it because light doesn't pass through it. A book and a brick wall are two examples of opaque materials.
Assignment=Explain what Translucent means in your journal
Assignment=Explain what opaque means in your journal
Properties of Light
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Photons
Rays
Waves
All of the above
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Assignment=Please copy this in your journal and put your answers in your journal.
| Properties of Light By Cindy Grigg |  |
Directions: Fill in each blank with the word that best completes the reading comprehension.
Light is one form of (1) _______________________ that travels in electromagnetic waves. This energy is both (2) _______________________ and electrical.There are many different types of electromagnetic (EM) waves. Most of them cannot be seen by humans. Our eyes see only a small (3) _______________________ of EM waves called visible light. Visible light is made up of different colors. The colors are red, orange, yellow, green, blue, indigo, and violet. The colors are due to the different wavelengths of light. The (4) _______________________ the wavelength, the less energy the wave has. The shorter the wavelength, the more energy it has. The(5) _______________________ wavelength of visible light looks red to us. The shortest wavelength of visible light looks violet to us.
Here are some properties of light:
Light travels out in all directions from its source. What are some sources of light? The sun is our main source of light on Earth. Some other sources are other stars and fire.
Light is made of little particles called photons. A photon is the smallest (6) _______________________ particle of electromagnetic radiation. These particles travel in waves.
Light travels in straight (7) _______________________ called rays.
Light travels "at the speed of light." This speed is about 186,000 miles per second (670 million miles per hour), or about 300,000 kilometers per second. The speed of light is sort of a galactic "speed limit." So far, nothing has been found that can travel faster than light.
Light can travel in a vacuum. A vacuum is empty space. There are no molecules of air or anything else in a vacuum. Like all forms of electromagnetic waves, light can travel through empty space, as well as through matter.
Light can be absorbed. Absorbed light energy is converted into some other form, such as (8) _______________________ or heat energy. You can test this by putting a piece of black construction paper and a piece of white construction paper on a sunny windowsill. Place a thermometer for measuring(9) _______________________ or room temperature under each piece of paper. Wait a few hours, and then check the two temperatures. The thermometer underneath the black paper should be hotter than the one under the white paper. This is the reason people tend to wear dark colors in the wintertime and white or light colors in the summer. Dark colors absorb light, (10) _______________________ us keep warmer in the winter. In the summer, light colors absorb little of the sun's energy, keeping us cooler.
Light can be reflected. If you shine light on a surface, some of that light will bounce off, or be reflected by, the surface. The law of(11) _______________________ tells us that light will always be reflected by a surface at the same angle at which it hits the surface.
Light can be refracted. Light always travels in straight lines. But when it passes from one medium into another, it changes direction slightly.(12) _______________________ occurs because light travels at different speeds through different materials. When light passes through air into water, for example, it slows down. The light rays are bent slightly. You can see this if you put a pencil into a half-glassful of water. The pencil looks bent or broken at the water line. This is due to refraction. Objects that we see get their color from the light they reflect. A green object looks green because it absorbs all other colors but reflects green.
Light can be transmitted. Sometimes light passes through matter. This is called (13) _______________________ . Light is transmitted through some matter more easily than through other kinds of matter. Light is transmitted through water, air, and glass very easily. These materials are said to be transparent. Transparent materials allow light to be transmitted through them easily. Some matter transmits some, but not all, of the light that hits it. This material is called (14) _______________________ . Some examples of translucent material are (15) _______________________ paper or glass blocks.Opaque matter does not transmit any light. You cannot see through it because light doesn't pass through it. A book and a brick wall are two examples of opaque materials.
Copyright © 2011 edHelper
Properties of Light
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Assignment=Please watch this video and take 10-20 notes from it in your journal.
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Light is everywhere and it allows us to receive information about the world around us. It comes from many sources such as fire, light bulbs, and fireflies and of course the sun. Without sunlight, there would be only a world of darkness where no plants would grow and therefore there would be no food for people and animals and no heat. Everything would be frozen.Light is a form of energy that you can detect with your eyes. It is a combination of magnetic and electric energy that travels extremely fast. Light is estimated to travel at the rate of approximately 300,000 km. per second. It can pass through anything that is transparent (objects which can be clearly seen through such as glass), partially through anything that is translucent (objects which can only be partially seen through such as white paper), but cannot pass through things that are opaque (objects that cannot be seen through such as a brick wall)...
ASSIGNMENT= Summarize this reading in your journal in 2-4 sentences.
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