Chapter 11 – Waves And Sound

Question 1

Maximum distance that particles are displaced by a wave

Answer 1

Amplitude

Question 2

Number of waves (crest and trough) that pass a given point per unit time

Answer 2

Frequency

Question 3

Reinforcement or cancellation that occurs when two or more waves meet

Answer 3

Interference

Question 4

Speeds above the speed of sound

Answer 4

Supersonic

Question 5

Speeds below the speed of sound

Answer 5

Subsonic

Question 6

What term describes the dissipation in energy of sound waves in matter?

Answer 6

Absorption

Question 7

Multiple reflections that cause sound to persist

Answer 7

Reverberation

Question 8

Study of sound

Answer 8

Acoustics

Question 9

Series of organized sound waves with specific pitches deliberately arranged

Answer 9

🎹🎷🎺Music🎸🎻

Question 10

Random sound with no intended pattern

Answer 10

🗣Noise👏🏻

Question 11

Difference in pitch between a note and a second note that has twice the frequency of the first note

Answer 11

Octave

Question 12

Distance between two notes

Answer 12

Interval

Question 13

Sound with the lowest frequency

Answer 13

Fundamental

Question 14

Sounds with higher frequencies than the fundamental

Answer 14

Overtones

Question 15

Substance such as water or air through which a wave transfers energy

Answer 15

Medium

Question 16

Constructive and destructive interference between the fundamental and overtones that give musical instruments distinctive sound quality

Answer 16

Timbre

Question 17

Set a frequencies at which an object vibrates

Answer 17

Natural frequencies

Question 18

Occurs when driving frequency and natural frequency and objects are the same or nearly the same

Answer 18

Resonance

Question 19

Regular pulses of compressed air produced any pipe organs pipes

Answer 19

Edge tone

Question 20

Two types of waves

Answer 20

Longitudinal and transverse waves

Question 21

Greek letter used to represent wavelength

Answer 21

Lambda

Question 22

The SI unit of frequency

Answer 22

Hertz

Question 23

Types of wave interference

Answer 23

Constructive and destructive

Question 24

Effects of frequency on the way the human ear perceives sound

Answer 24

Pitch

Question 25

The main factor affecting the speed of sound

Answer 25

Temperature of the air

Question 26

A sound heard distinctly after being reflected from an object

Answer 26

Echo

Question 27

The pulses of sound heard when close frequencies interfere

Answer 27

Beats

Question 28

The three main classes of acoustic instruments

Answer 28

Strings winds and percussion

Question 29

Family of instruments that includes the trumpet and the tuba

Answer 29

Brass family

Question 30

What does sonar stand for

Answer 30

Sound navigation and ranging

Question 31

How is the diffraction related to the wavelength of a wave

Answer 31

Diffraction causes the wave to spread out evenly when the opening is roughly equal to one wavelength

Question 32

What is the difference between loudness and intensity

Answer 32

Loudness – effect of intensity on the way the human ear perceives sound
Intensity – strength of a soundwave

Question 33

Explain the difference between infrasonic ultrasonic an audible sounds

Answer 33

Infrasonic sounds – sounds with pitches below the audible range
Ultrasonic sounds – sounds of pitches about the audible range
Audibles sounds – sounds that can be heard for humans

Question 34

How can frequency be used to predict consonance and dissonance

Answer 34

Theoretically, the combination of two notes is more consonant when the relation between their frequencies is expressed in the smallest whole numbers possible

Question 35

What is reflection and what is refraction?

Answer 35

Reflection – change in the course of a wave as a result of the collision with an object or boundary
Re-fraction – bending of the path of a wave as a result of a change in waves speed