Week 2

Question 1

Sound is what kind of wave?

Answer 1

Longitudinal

Question 2

Boundary Behaviors

Answer 2

• Soft boundaries absorb energy and hard ones reflect
• When a wave hits a solid surface, it inverts (from + to -)

Question 3

Interference Patterns

Answer 3

• Signals of the same frequency can interfere with each other
• Often occurs when the same frequency is generated from two sources OR when the signal is reflected from a barrier

Question 4

Pure Tones

Answer 4

• A single, periodic frequency, vibrating and simple, harmonic motion creates a sine wave
• A vibration that repeats itself at a constant number of cycles per second

Question 5

Complex Tones (most of the world)

Answer 5

• Nature of complex waves
• mini sign waves of different frequencies = a complex wave
• Most sound source produce these complex vibrations of more than one frequency rather than the pure tone

Question 6

Complex waves are…

Answer 6

Pure tones

Question 7

What are the two kinds of complex tones?

Answer 7

1. Aperiodic
2. periodic

Question 8

Aperiodic

Answer 8

• Complex
• If the vibration is random and has no repeatable pattern, the wave is a complex Aperiodic sound wave.

Question 9

Periodic

Answer 9

• If a pattern of vibration repeats itself it is periodic

Question 10

Fundamental Frequency

Answer 10

The fundamental frequency is based on the rate at which the sound source produces its vibratory cycle

Question 11

Harmonics

Answer 11

A sound wave that has a frequency

Question 12

A simple periodic tone…

Answer 12

Has one component frequency and is frequently called “a pure tone”

Question 13

A complex periodic tone…

Answer 13

two or more component frequencies that are related harmonically. Usually called “a complex tone”