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Abeka Physical Science > Test 5 > Flashcards

Test 5 Flashcards

1
Q

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

A

loudness

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2
Q

What is the most consonant ratio between two notes?

A

1:2

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3
Q

What is the result when two notes interfere harmoniously?

A

consonance

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4
Q

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?

A

resonance

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5
Q

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

A

medium

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6
Q

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

A

infrasonic

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7
Q

What technique uses the reflection of sound to calculate distance?

A

echo ranging

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8
Q

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

A

interference

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9
Q

What property is directly proportional to wave speed?

A

wavelength

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10
Q

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

A

bends toward the medium that causes slower speed

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11
Q

What is the relationship between sound intensity and distance?

A

Intensity is inversely proportional to the square of distance

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12
Q

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

A

The sounds are too close in time to be distinguished

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13
Q

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

A

Sound cannot travel through a vacuum

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14
Q

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

A

harmonic series

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15
Q

What is the most dominant sound of a musical note?

A

fundamental

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16
Q

What is a musical instrument’s distinctive sound quality?

A

timbre

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17
Q

What is the low point of a wave called?

A

trough

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18
Q

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

A

refraction

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19
Q

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

A

music

20
Q

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

A

echo

21
Q

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

A

transverse

22
Q

What is a random sound with no intended pattern?

A

noise

23
Q

high point of a wave train

A

crest

24
Q

number of waves that pass a point per unit time

A

frequency

25
Q

maximum distance particles are displaced in a wave train

A

amplitude

26
Q

strength of a sound wave

A

intensity

27
Q

perpendicular line from which reflection is measured

A

narmal

28
Q

musical distance between two notes

A

interval

29
Q

A change in frequency caused by an object’s motion

A

Doppler effect

30
Q

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

A

absorption

31
Q

vibrations traveling through a medium as longitudinal pressure waves

A

sound

32
Q

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

A

rarefaction

33
Q

The length of a wave

A

wavelength

34
Q

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

A

diffraction

35
Q

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

A

octave

36
Q

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

A

law of reflection

37
Q

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

A

natural

38
Q

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

A

supersonic

39
Q

A periodic back-and-forth motion that transmits energy

A

wave

40
Q

The effect of frequency on the way our ear perceives sound

A

pitch

41
Q

The speed of a wave is ________ proportional to frequency.

A

directly

42
Q

waves that strike an obstacle

A

incident

43
Q

The study of sound

A

acoustics

44
Q

The period of a wave formula

A

T=1/f

45
Q

the speed of sound formula

A

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

46
Q

the frequency of a wave formula

A

f=N/t

47
Q

the speed of a wave formula

A

v=wavelength x frequency

Abeka Physical Science (8 decks)

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