MC	6^th Grade	Standard: 06
Objective: 03. Describe the production of sound in terms of objects that create vibrations in other materials.
ILO:

Comparing both the frequency (pitch) and the amplitude (volume) of these two sounds, which of the following is correct?

a. Sound A is higher in pitch and higher in volume than Sound B.

b. Sound A is lower in pitch and lower in volume than Sound B.

c. Sound A is higher in pitch and lower in volume than Sound B.

d. Sound A is lower in pitch and higher in volume than Sound B.

Correct Answer: b

E	6^th Grade	Standard: 06
Objective: 03. Describe the production of sound in terms of objects that create vibrations in other materials.
ILO:

Michael was invited to pay his clarinet with the marching band. A clarinet sound is produced when air is blown past a reed placed on the mouthpiece. During band practice, volume, pitch and tone mixed well together. On the day of the first parade, there was a thirty-minute delay before the band began marching. Michael found he could not make the clarinet make a sound. Explain how knowledge of sound production could help Michael make his clarinet play again.

Possible Answer:

Air vibrations traveling in waves from a source produce sound. Michael would need to find a way to make the reed begin to vibrate for sound to be produced.

E	6^th Grade	Standard: 06
Objective: 03. Describe the production of sound in terms of objects that create vibrations in other materials.
ILO:

1. Compare what happens to sound and visible light as the frequency increases.

2. Compare what happens to sound and visible light when they strike matter.

3. Compare the speed of sound with the speed of light.

4. Compare the movement of sound with the movement of light.

Correct Answers:

1. As the frequency of a sound increases, the pitch becomes higher. As the frequency of light increases, the color of the light changes (lower frequenciesÉÉ.red ˆ orange ˆ yellow ˆ green ˆ blue ˆ indigo ˆ violetÉÉhigher frequencies).

2. When sound strikes matter, it may be transmitted, absorbed, and/or reflected. When light strikes matter, it may be transmitted, absorbed, and/or reflected. Some sound energy may turn into mechanical energy when it strikes matter. Some light energy is turned into heat energy when it strikes matter.

3. Light travels much faster than sound. Light travels at about 300,000 km per second while sound travels about 340 miles per second. The speed of both sound and light is affected by the medium they are traveling through.

4. Both move as waves (although a light can travel like a particle). Both sound and light travel in the same way. Light is just easier to collimate into a beam. Sound needs matter to travel through while light can travel through a vacuum.

E	6^th Grade	Standard: 06
Objective: 03. Describe the production of sound in terms of objects that create vibrations in other materials.
ILO:

List and explain at least five examples of how your knowledge of sound energy helps you understand the world around you. Two examples must include technology.

Possible Answer:

I know that sound is made from vibration and that I hear because of sound waves causing vibrations in my inner ear. Therefore, I know that if the sound waves have great amplitudes (are very loud) these vibrations can damage my hearing. So I should wear earplugs when mowing the lawn and keep the volume down on my CD player.

I know that low frequency produces low-pitched sounds and high frequency produces high-pitched sounds. Therefore, I know that I can produce different sounds on my guitar by changing which string I pluck and changing the length of that string.

I know that sound waves can reflect when they hit matter and, therefore, understand echoes. I know that bats locate objects by sending off high-pitched sounds that reflect and return to their very sensitive ears.