06.08 Light DBA

Light DBA

Lesson 06.08

Light Sources

Light comes from many different sources. These sources take different shapes and sizes and can be bright or dim. They all have one thing in common: they all give off light energy.

How Does Light Travel?

Light only travels in straight lines. It moves out of its source and travels along until it hits something else.

Multiple Select

Which items are sources of light? Check all that apply.

• campfire

• flashlight

• piano

• fireflies

Multiple Select

How does light travel?

Check the box with the correct answer.

• Light rays curve as they travel away from the source.

• Light travels in a straight line away from its source.

Transparent

Light passes through easily.

Translucent

Some light passes through.

Opaque

No light passes through.

Shadows

Shadows are more proof that light travels in straight lines. When light is blocked by an opaque object, it can’t reach the surface where we see the shadow. Light travels in straight lines all around the object but not through it. The outline of the object’s shape appears on the surface around the darker area where the light was blocked.

Multiple Choice

Which of the following items is transparent?

• ball

• door

• tissue paper

• window

Multiple Choice

Which of the following items is translucent?

• ball

• door

• tissue paper

• window

Multiple Choice

Which of the following items is opaque?

• door

• window

• tissue paper

• glass

Multiple Choice

Which of the following correctly explains how a shadow forms?

• Light passes through an opaque object.

• Light passes through a transparent object.

• Light is blocked by an opaque object.

• Light passes through a translucent object.

Reflection

When light reflects from a smooth surface, like a mirror, shiny metal, or glass, light rays are reflected back in the same direction, which allows us to see our image on the smooth surface. 

I See the Moon...

When the light from the sun hits the moon, it reflects or bounces off its surface. That's why it looks like the moon is shining at night.

How Do We See Different Colors?

The colors of light reflected off the object are the only colors we can see when we look at an object. For example, a red rose looks red because when light hits the rose, the red light is being reflected off the rose. The other colors of light are being absorbed by the rose. We do not see absorbed colors, only reflected ones.

In the Heat of the Light

Once light is absorbed into an object, the light energy changes into heat energy. The more light that is absorbed, the hotter the object becomes.

Refraction

Refraction is when light is bent or changes direction as it travels through different mediums. Refracted light makes objects appear to be larger or closer, as the light travels from one medium to another. 

Multiple Choice

If you shine a flashlight on a mirror, what happens to the light?

• The light will refract.

• The light will be absorbed by the mirror?

• The light will break the mirror.

• The light will reflect or bounce back.

Multiple Choice

This picture is an example of

• Refraction

• Transparent

• Reflection

• Translucent

Multiple Choice

Which of the following explains why we can see the moon at night?

• There is a giant moon lamp in the sky.

• Santa turns the moon on and off each day.

• Light from the sun hits the moon and reflects or bounces off its surface.

• Light from the sun is being refracted.

Multiple Choice

Why does Santa's shirt look red?

• The colors of light are being reflected and the red light is being absorbed by his shirt.

• The colors of light are being absorbed by his shirt and the red light is being reflected.

• Santa is shining a bright red light on a white shirt?

• Rudolph's nose is shining very bright!

Multiple Choice

What do we call light that we can see?

• Absorbed Light

• Rudolph's Nose

• Reflected Light

• Disco Lights

Multiple Choice

How can light energy make a glass of warm water?

• A glass of water can absorb light from the sun and produce heat energy.

• A glass of water can reflect light from the sun and produce heat energy.

• A glass of water is placed in a microwave.

• Light energy cannot make a glass of warm water.

Multiple Choice

What happens when light travels from air into water?

• Light refracts because it changes size in a new medium.

• Light refracts because it changes direction in a new medium.

• Light refracts because it changes color in a new medium.

• Light refracts because it changes shape in a new medium.