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when lights hit something, it can be bent, bounced or absorbed

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Light travels in a straight line unless it hits something or is pulled by gravity

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When light is transmitted through or reflected off a material, the energy is not absorbed, so the material does not change.

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The movement of energy can be tracked by observing the changes the energy causes to matter.

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Investigation Question:
What happens to energy when light is transmitted through or reflected off a material?

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A material transmits or reflects some types of light and not others.

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Claims About How Light Travels

Claim 1: Light can travel in a curved line.

Claim 2: Light can go through materials.

Claim 3: Light can bounce off materials.

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Key Concept

10.

When a light wave hits a material, the light can be absorbed by the material, transmitted through the material, or reflected off the material.

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Key Concept

9.

Light travels in a straight line.

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Vocabulary

reflect

to bounce off without absorbing

(noun form: reflection)

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Vocabulary

transmit

to pass through

(noun form: transmission)

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Investigation Question:
What can happen to light as it travels?

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Chapter 3 Question:

Why does Australia get more UV light than other parts of the world?

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Claim 1: Light from the sun and light from a light bulb can cause skin cancer.
Claim 2: Light from the sun can cause skin cancer, but light from a light bulb cannot.

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A material absorbs energy from some types of light and not others.

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Investigation Question:
What makes types of light different?

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January 28th

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Key Concept

7.

Different types of light have different wavelengths.

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Vocabulary

wavelength

the distance from one peak of a wave to the next

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Vocabulary

frequency

the number of peaks of a wave that pass in a second

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Vocabulary

light

a type of wave that carries energy from one place to another, even through empty space

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Vocabulary

wave

a pattern that describes how energy is carried from one place to another

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Investigation Question:
What makes types of light different?

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6: A light source can emit more than one type of light.

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There are different types of light that can change a material in different ways.

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We know there are different light sources, like the sun or a lamp, but that’s not the question. We are investigating whether the light emitted by the different sources can be different.

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Is all light the same?

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Claim 2: There is something different about the sunlight in Australia.
Claim 3: More people in Australia have skin that is easily damaged by light from the sun.

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Light source an object that emits light

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emit

to give off

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How can the same amount of sunlight cause different rates of skin cancer?

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Claim 1: Australia gets a lot of sunlight
Claim 2: There is something different about the sunlight in Australia
Claim 3: More people in Australia have skin that is easily damaged by the light from the sun.

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Key Concept

Energy and Matter

The movement of energy can be tracked by observing the changes the energy causes to matter.

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Chapter 1 Question

How does light from the sun cause skin cancer?

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When a material absorbs energy from light, the energy causes the material to change.

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When light hits a material, the material can absorb energy from the light.

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Vocabulary

absorb

to take in (noun form: absorption)

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Vocabulary

visualize

to form a mental picture of something that cannot be seen

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Why can light cause materials to change

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Vocabulary

light

something that carries energy from one place to another

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Key Concept

Light carries energy that causes materials to change.

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Key Concept

Energy and Matter

The movement of energy can be tracked by observing the changes the energy causes to matter.

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Vocabulary

energy

the ability to make things move or change

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Chapter 1 Question:

How does light from the sun cause skin cancer?

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Light from the sun can cause damage to genetic material—DNA—inside skin cells. Over time, that damage may lead to skin cancer. As student spectroscopists, you will investigate skin cancer.

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In this unit, you’ll take on the role of student spectroscopists— scientists who study light and how it interacts with materials. Now, we will hear from Dr. Whitmore, a real spectroscopist.

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Unit Question:

How does light interact with materials?