REVIEW : Unit 8 Test

What part of the instrument is the sound source?

• head
• strings
• soundboard
• pedals

What would you expect to see these sound sources doing anytime one of them produces a sound?

• remain unchanged
• express a high pitch
• travel in the direction of the sound wave
• vibrate back and forth

What does the musician need to do differently when she interacts with these sound sources in order to get them to produce softer sounds?

• Nothing, the length of the sound source determines the loudness or softness.
• She should pluck the sound sources with more force.
• She should pluck the sound sources with less force.
• She should pull the harp closer to her.

Correctly order step-by-step what the sound source is doing when it makes a sound. Step 1 should show what the sound source looks like before it makes a sound. The middle steps should show what the sound source looks like as it is making a sound. Step 4 should show what the sound source looks like when it stops making a sound.

• C, D, B, A
• A, D, B, A
• A, C, D, A
• D, A, B, D

Which of the harp graphs shows the high pitch, high loudness sound?

• Graph D

• Graph C

• Graph A

• Graph B

What EVIDENCE would help you choose the high pitch, high loudless sound graph? (Choose all that apply)

• the distance from crest to crest
• amplitude
• the distance between the resting position and the crest
• frequency
• wavelength

What evidence from the other two NON-choices was the most important in NOT picking those graphs?

• Their frequencies appear to be the same.
• The amplitudes were both lower.
• The frequencies and amplitudes of both were lower.
• The distance from the rest position to the crest were both lower.

Identify the correct relationships. (Choose 2)

• longer wavelengths are lower pitched
• lower frequencies are higher pitched
• shorter amplitudes have less energy
• larger amplitudes are quieter sounds

Which type of signal is most reliable?

• a. Analog signals
• b. Digital signals
• c. Wave signals
• d. Flash signals

What does it mean to encode information?

• a. To convert into a form and give it meaning
• b. To decipher and figure out what it means
• c. To change the frequency of the wave
• d. To explain something