Third Grade Light and Sound Flashcard

Front

What is an opaque material?

Back

An opaque material does not allow light to pass through it. Example: Brick.

Front

What does it mean to reflect light?

Back

To reflect light means to bounce light off a surface. Examples: Mirror, shiny foil, and a lake.

Front

What is light?

Back

Light is a form of energy that allows us to see things.

Front

Why are mirrors made of glass?

Back

Mirrors are made of glass because glass is smooth, which helps reflect light clearly.

Front

What is a prism?

Back

A prism is an object that separates light into different colors.

Front

What is a transparent material?

Back

A transparent material allows light to pass through it. Example: Water.

Front

What is a translucent material?

Back

A translucent material allows some light to pass through, but not all. Example: Tissue paper.

Front

What is sound?

Back

Sound is a form of energy that we can hear.

Front

How do we hear sound?

Back

We hear sound when vibrations travel through the air and reach our ears.

Front

What is an example of a sound source?

Back

A sound source is something that makes sound, like a musical instrument or a person talking.