Chapter 9: What is Light? (3rd grade science)
14 December 2020
question
light
answer
energy you can see
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reflection
answer
bouncing light
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refraction
answer
bending of light
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absorption
answer
taking in of light
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measure
answer
how much? or how many?
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conclude
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come up with an answer
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What is light?
answer
Form energy you can see
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Name the sources of light written in the text and pictures on pages 298-299.
answer
sun, fire, lamp, and light bulb
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Why is the sun important?
answer
living things around the world need energy from the sun
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How is the sun LIKE a light bulb?
answer
creates light and gives heat
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How is the sun DIFFERENT from a light bulb?
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1) does NOT require electricity, 2) it’s natural light
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Sun characteristics:
answer
natural light, doesn’t require electricity; creates light, and gives off heat
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Light bulb characteristics:
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artificial light, requires electricity, creates light, and gives off heat
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What is reflection?
answer
bouncing light (travels to in a straight line and then bounces off in a straight line)
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What happens to light when it hits a smooth, shiny surface?
answer
it reflects
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Could you see a clear, sharp reflection in a piece of crumpled shiny wrapping paper?
answer
No. It would be bumpy.
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Infer: How does reflected light allow you to read?
answer
Light reflects from the page to your eyes
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What is refraction? What happens to light as it passes from air to water?
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Bending light. It bends.
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What happens to white light when it passes through a prism? What do you see?
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Each color bends differently. It creates a rainbow.
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How is refraction DIFFERENT from reflection?
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Reflection: BOUNCING light Refraction: BENDING light
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What creates a rainbow?
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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 is absorption?
answer
taking in of light
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Which absorbs more light – a dark blue object or light blue object? Explain.
answer
Dark blue – dark colors absorb more light; lighter colors reflect more light
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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?
answer
Bright/light colors reflect the light (and heat) while dark colors absorb the light (and heat)
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Describe shadow:
answer
blocked light
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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?
answer
because the light couldn’t reach it
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What 3 things do you need to make a shadow?
answer
1) light source 2) object 3) a place the light can’t reach
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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?
answer
The sun is in different places each time, changing your shadow.
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How can you make a shadow disappear?
answer
Shine a light on the shadow and it will become more faint.
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What is light pollution?
answer
excessive, misdirected, or obtrusive artificial light that makes it so we can’t see the stars
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What sources of light could cause light pollution?
answer
city lights, parking lot lights, baseball field lights
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How can you reduce light pollution?
answer
turn off lights
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How do you think people are making beaches too bright for turtles to lay their eggs on?
answer
Lighted houses on the beach
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In some places, why is it hard to see the stars at night?
answer
light pollution
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What is a laser?
answer
man-made light
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How are laser light and sunlight alike?
answer
they both give off light
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How are laser light and sunlight different?
answer
laser light is controllable / sunlight is NOT controllable
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What properties of laser light make lasers useful to people?
answer
it’s controllable and you can direct it to one spot
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When lasers were first invented, people called them:
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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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Uses for lasers in everyday life:
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cell phones, phones, entertainment, ipods, ipads
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How do people use lasers to communicate?
answer
cell phones, phones