Chapter 9: What is Light? (3rd grade science)
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energy you can see
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light
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bouncing light
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reflection
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bending of light
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refraction
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taking in of light
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absorption
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how much? or how many?
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measure
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come up with an answer
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conclude
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Form energy you can see
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What is light?
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sun, fire, lamp, and light bulb
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Name the sources of light written in the text and pictures on pages 298-299.
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living things around the world need energy from the sun
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Why is the sun important?
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creates light and gives heat
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How is the sun LIKE a light bulb?
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1) does NOT require electricity, 2) it's natural light
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How is the sun DIFFERENT from a light bulb?
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natural light, doesn't require electricity; creates light, and gives off heat
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Sun characteristics:
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artificial light, requires electricity, creates light, and gives off heat
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Light bulb characteristics:
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bouncing light (travels to in a straight line and then bounces off in a straight line)
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What is reflection?
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it reflects
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What happens to light when it hits a smooth, shiny surface?
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No. It would be bumpy.
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Could you see a clear, sharp reflection in a piece of crumpled shiny wrapping paper?
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Light reflects from the page to your eyes
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Infer: How does reflected light allow you to read?
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Bending light. It bends.
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What is refraction? What happens to light as it passes from air to water?
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Each color bends differently. It creates a rainbow.
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What happens to white light when it passes through a prism? What do you see?
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Reflection: BOUNCING light Refraction: BENDING light
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How is refraction DIFFERENT from reflection?
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Rainbows are created by both reflection (bouncing) and refraction (bending) of light in water droplets in the atmosphere, which results in a spectrum of light appearing.
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What creates a rainbow?
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taking in of light
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What is absorption?
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Dark blue - dark colors absorb more light; lighter colors reflect more light
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Which absorbs more light - a dark blue object or light blue object? Explain.
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Bright/light colors reflect the light (and heat) while dark colors absorb the light (and heat)
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You are outside in the sun in white clothes. You feel comfortable. Your friend is wearing black. He is complaining about being hot. What is happening?
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blocked light
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Describe shadow:
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because the light couldn't reach it
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Why is the boy's hand on page 308 casting a shadow on the wall? What happened to the light that hit the boy's hand?
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1) light source 2) object 3) a place the light can't reach
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What 3 things do you need to make a shadow?
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The sun is in different places each time, changing your shadow.
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It's a sunny day and you stand on the sidewalk at noon. You then stand in the same place in the early evening. Your shadow is different each time. Why?
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Shine a light on the shadow and it will become more faint.
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How can you make a shadow disappear?
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excessive, misdirected, or obtrusive artificial light that makes it so we can't see the stars
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What is light pollution?
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city lights, parking lot lights, baseball field lights
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What sources of light could cause light pollution?
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turn off lights
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How can you reduce light pollution?
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Lighted houses on the beach
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How do you think people are making beaches too bright for turtles to lay their eggs on?
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light pollution
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In some places, why is it hard to see the stars at night?
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man-made light
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What is a laser?
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they both give off light
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How are laser light and sunlight alike?
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laser light is controllable / sunlight is NOT controllable
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How are laser light and sunlight different?
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it's controllable and you can direct it to one spot
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What properties of laser light make lasers useful to people?
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"a solution looking for a problem"; meaning that scientists did not know what to use them for
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When lasers were first invented, people called them:
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cell phones, phones, entertainment, ipods, ipads
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Uses for lasers in everyday life:
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cell phones, phones
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How do people use lasers to communicate?
