Test 5

Question 1

What is the effect of intensity on the way the human ear perceives sound?

Answer 1

loudness

Question 2

What is the most consonant ratio between two notes?

Answer 2

1:2

Question 3

What is the result when two notes interfere harmoniously?

Answer 3

consonance

Question 4

What term describes a situation in which a driving frequency on an object is the same as or nearly the same as one of the object’s natural frequencies?

Answer 4

resonance

Question 5

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

Answer 5

medium

Question 6

What term refers to sound that has too low a frequency to be heard?

Answer 6

infrasonic

Question 7

What technique uses the reflection of sound to calculate distance?

Answer 7

echo ranging

Question 8

What is the reinforcement or cancellation that occurs when two or more sound waves meet?

Answer 8

interference

Question 9

What property is directly proportional to wave speed?

Answer 9

wavelength

Question 10

What happens to a wave when it passes between two media?

Answer 10

bends toward the medium that causes slower speed

Question 11

What is the relationship between sound intensity and distance?

Answer 11

Intensity is inversely proportional to the square of distance

Question 12

Why can an echo not be heard if the source of the sound is less than 17 m from the reflecting surface?

Answer 12

The sounds are too close in time to be distinguished

Question 13

Movies and television shows often include sounds from rocket engines being heard in the vacuum of space. Why is this incorrect?

Answer 13

Sound cannot travel through a vacuum

Question 14

Which of the following describes the frequency relationships between a fundamental and its overtones?

Answer 14

harmonic series

Question 15

What is the most dominant sound of a musical note?

Answer 15

fundamental

Question 16

What is a musical instrument’s distinctive sound quality?

Answer 16

timbre

Question 17

What is the low point of a wave called?

Answer 17

trough

Question 18

What is the bending of the path of a wave as a result of a change in wave speed?

Answer 18

refraction

Question 19

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

Answer 19

music

Question 20

What is a sound heard distinctly after being reflected from some object?

Answer 20

echo

Question 21

Which type of wave has particles of the transmitting medium oscillating at right angles to the direction of wave travel?

Answer 21

transverse

Question 22

What is a random sound with no intended pattern?

Answer 22

noise

Question 23

high point of a wave train

Answer 23

crest

Question 24

number of waves that pass a point per unit time

Answer 24

frequency

Question 25

maximum distance particles are displaced in a wave train

Answer 25

amplitude

Question 26

strength of a sound wave

Answer 26

intensity

Question 27

perpendicular line from which reflection is measured

Answer 27

narmal

Question 28

musical distance between two notes

Answer 28

interval

Question 29

A change in frequency caused by an object's motion

Answer 29

Doppler effect

Question 30

The process of dissipating the energy of sound waves in matter.

Answer 30

absorption

Question 31

vibrations traveling through a medium as longitudinal pressure waves

Answer 31

sound

Question 32

The portion of a wave in which the particles are spread out is a _______ pulse.

Answer 32

rarefaction

Question 33

The length of a wave

Answer 33

wavelength

Question 34

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

Answer 34

diffraction

Question 35

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

Answer 35

octave

Question 36

The relationship between the angle of incidence and angle of reflection is described by the _______.

Answer 36

law of reflection

Question 37

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

Answer 37

natural

Question 38

What is an object traveling faster than the speed of sound called?

Answer 38

supersonic

Question 39

A periodic back-and-forth motion that transmits energy

Answer 39

wave

Question 40

The effect of frequency on the way our ear perceives sound

Answer 40

pitch

Question 41

The speed of a wave is ________ proportional to frequency.

Answer 41

directly

Question 42

waves that strike an obstacle

Answer 42

incident

Question 43

The study of sound

Answer 43

acoustics

Question 44

The period of a wave formula

Answer 44

T=1/f

Question 45

the speed of sound formula

Answer 45

v= 331 m/s +(0.61m/s)(T/1C)

Question 46

the frequency of a wave formula

Answer 46

f=N/t

Question 47

the speed of a wave formula

Answer 47

v=wavelength x frequency