The number of vibrations per second a sound makes refers to___________________________.

• volume
• pitch
• frequency
• amplitude

Five students are playing straw flutes. They want to play a song, but their flutes all make the same note.  How can they change the pitch of their flute?

• They can blow harder across the straw.
• They need to cut the straws to make them different lengths.
• They need to point their straws in different directions.
• They need to blow across the other end of the straw.

Sound travels fastest through which medium?

• the ocean
• a steel pipe
• in a vacuum (a place with no air or matter)
• in the air

When light bounces off a smooth, shiny surface, what process has occurred?

• refraction
• reflection
• transmission
• photosynthesis

Which of the following would reflect rather than refract light?

• small lens
• shiny mirror
• dull black paper
• magnifying glass

The loudness or softness of a sound is called ___________.

• volume
• pitch
• frequency
• molecules

Sophia shouts in the school courtyard and hears an echo.  What is causing the echo?

• sound is absorbed by the surface
• sound is reflected off the surface
• the pitch of her voice increased
• the volume of her voice increased

A teacher fills five glasses with different amounts of water.  The teacher lightly taps each glass and a sound is made by the vibrations.  The rate of vibration varies depending on the amount of water in the glass.  Which property of sound varies from glass to glass?

• the pitch of the sound
• the echo of the sound
• the speed of the sound
• the volume of the sound

Which type of lens is thick in the middle to make objects larger?

• concave
• convex
• flat
• glass

The sound that a person hears from a drum is produced by

• echoes
• reflections
• pulses
• vibrations