Test 8

Question 1

The sound that occurs when a lip in the path of a flow of air causes regular pulses of compression, as in an organ pipe, is a(n)

Answer 1

edge tone

Question 2

What is the most versatile and widely played instrument in modern times?

Answer 2

piano

Question 3

Sound with frequency below the range of human hearing is ? sound.

Answer 3

infrasonic

Question 4

Sound that can be heard is ? sound

Answer 4

audible

Question 5

When two notes interfere harmoniously, the result is known as ?

Answer 5

consonance

Question 6

When a driving frequency and a natural frequency are the same or nearly the same, they are in?

Answer 6

resonance

Question 7

The number of waves that pass a given point per unit time is the wave’s?

Answer 7

frequency

Question 8

The maximum distance that particles are displaced by a wave is the wave’s?

Answer 8

amplitude

Question 9

The time needed for one wave to pass is the wave’s?

Answer 9

period

Question 10

What is random sound with no intended pattern?

Answer 10

noise

Question 11

The law of reflection states that the angle of incidence is ? the angle of reflection.

Answer 11

equal to

Question 12

A periodic back-and-forth motion that transmits energy is a wave.

Answer 12

true

Question 13

The effect of frequency on the way our ear perceives sound is loudness

Answer 13

pitch

Question 14

Sounds produced by a musical instrument at higher frequencies than the fundamental are called edge tones.

Answer 14

overtones

Question 15

The set of frequencies at which an object vibrates are its natural frequencies.

Answer 15

true

Question 16

A musical instrument’s distinctive sound quality is its pitch.

Answer 16

timbre

Question 17

The family of instruments in which pitch is varied by opening and closing holes in a tube is the brass.

Answer 17

woodwind

Question 18

Sound heard distinctly after being reflected from an object.

Answer 18

echo

Question 19

Multiple reflections causing a persistence of sound not heard as separate sounds.

Answer 19

reverberation

Question 20

Loud noise caused by a shock wave

Answer 20

sonic boom

Question 21

Strength of a sound wave

Answer 21

intensity

Question 22

Violent compression pulse caused by an object moving faster than the speed of sound.

Answer 22

shock wave

Question 23

Effect of sound-wave strength on the way the human ear perceives sound.

Answer 23

loudness

Question 24

Change in a wave’s direction when passing from one substance into another.

Answer 24

refraction

Question 25

Name the two kinds of waves interference

Answer 25

constructive | destructive

Question 26

What is a series of organized sound waves with specific pitches that have been deliberately arranged?

Answer 26

music

Question 27

What is a hollow body that reverberates sound waves produced by an instrument to make the sound louder?

Answer 27

resonator

Question 28

What is the substance through which a wave transfers energy called?

Answer 28

medium

Question 29

What phenomenon is vibrations traveling through a medium in the form of longitudinal pressure waves?

Answer 29

sound

Question 30

The spreading out of a wave after it passes through a narrow opening is called?

Answer 30

diffraction

Question 31

The mutual reinforcement or cancellation that occurs when two or more waves meet is?

Answer 31

interference

Question 32

The change in the course of a wave as a result of a collision with an object is called?

Answer 32

reflection

Question 33

The most dominant sound produced when a musical instrument plays a single note is the?

Answer 33

fundamental

Question 34

What is the difference in pitch between a note and a second note that has twice the frequency of the first note?

Answer 34

octave

Question 35

Which family of instruments includes the trumpet and tuba?

Answer 35

brass

Question 36

Which family of instruments are played by being struck?

Answer 36

percussion

Question 37

The unit used to measure sound intensity in a way that reflects how our ears perceive sound is the?

Answer 37

decibel

Question 38

What is the SI unit of frequency?

Answer 38

hertz

Question 39

In music, the distance between two notes is called a(n)?

Answer 39

interval

Question 40

A change in the sound frequency caused by an object's motion is the?

Answer 40

Doppler effect

Question 41

The length of a wave is the?

Answer 41

wavelength

Question 42

A system that uses sound to detect underwater objects is?

Answer 42

sonar

Question 43

The process of dissipating the energy of sound waves in matter is?

Answer 43

absorption

Question 44

The frequency relationships between the fundamental and overtones are described by the?

Answer 44

harmonic series

Question 45

A sound of definite pitch, produced by a singing voice or a musical instrument, is a(n)?

Answer 45

note

Question 46

Find the speed of a wave that has a wavelength of 6.0 m and a frequency of 2.0 Hz.

Answer 46

Use v = ^f ^ = wavelength f = frequency

Question 47

Calculate the frequency and period of a wave with a speed of 10 m/s and a wavelength of 5.0 m.

Answer 47

Use f = v/^ for frequency Use T = 1/f ^ = wavelength 1 = 1 v = speed f = frequency