Sound Waves

An ________ is a reflected sound.

• Vibration
• Echo
• Pitch
• Volume

If you want to change the pitch of a sound, you have to change the ___

• frequency
• amplitude
• speed
• volume

The speed of a sound wave depends on

• the frequency
• the medium
• both air temperature and medium
• the air temperature

What unit is the intensity of sound measured in?

• decibels (dB)
• Hertz (Hz)
• meters per second (m/s)
• meters

A note is played on a guitar.  Next, a lower note is played on the guitar.  Which of these statements describes the lower note?

• Both notes vibrated at the same speed.
• The second note vibrated slower.
• The second note vibrates at a higher frequency.
• The second note vibrated faster.

You and your father inspect an empty house with the hopes of buying it. You walk through the rooms talking to one another, and you notice that your voices and footsteps are echoing in the big, empty house. What causes the echo?

• sound waves reflecting off smooth, flat surfaces throughout the house
• sound waves moving around the large rooms
• sound waves moving slowly through air
• sound waves refracting around corners in the empty rooms

When a sound is louder what measurement gets bigger?

• Frequency 
• Amplitude 
• Wavelength 
• Crest

Sound is made when a source of energy forces the matter around it to __________.

• Vibrate

• Amplitude

• Stay still

• Pitch

Sound waves CANNOT travel through which of these:

• Paper

• Milk

• Outer space

Sound is produced when something ______________

• Vibrates
• Moves through empty space