Sound and Light

What do we call the back and forth movement of matter?

The loudness of sound is called

How high or low a sound is is called

______________ is the measurement of the number of vibrations per second.

A ______________ lens is a lens that is thinner in the middle and makes an object appear smaller.

A lens that is thicker in the middle and makes an object appear bigger is called a ____________ lens.

______________ is the bending of light rays.

Which of the following objects is translucent?

Which surface would bounce back almost all of the light that hit it?

A frontier family made a window by rubbing grease all over a thick piece of paper. When the paper was used as a window, it let in light, but the family could not see through it. Which word describes the greased paper?