Lecture (2/15) Week 5 Thursday Flashcards

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1
Q

Reflected waves can ________ in a medium

A

interact with the original waves

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2
Q

What are the 3 examples of reflection?

A

standing waves
destructive interference
constructive interference

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3
Q

What is a standing wave

A

An example of reflection where the 2 waves are identical except they are out of phase, so they cancel out and create a dead spot

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4
Q

What is a destructive interference

A

An example of reflection where the amplitude lessens
-complete destructive interference creates standing waves: appears as if the vibrations are standing still

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5
Q

What is constructive interference

A

amplitude of interaction is increased

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6
Q

Absorption minimizes _____ and reduces ______

A

transmission, reflection

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7
Q

During absorption, energy is ____ and dissipated in the form of _____

A

absorbed, heat

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8
Q

What materials are best for absorption?

A

-soft, porous material
-acoustic tile
-egg cartons
-sound baffels

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9
Q

Sound baffles increase _____ and ______ and descreases ______ and _________

A

absorption and reflection
transmission and diffraction

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10
Q

Absorption ______ deadspots

A

reduces

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11
Q

Diffraction is when

A

sound goes around an object

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12
Q

Diffraction is dependent on the _____ and _____ of an object

A

wavelength and size

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13
Q

T/F diffraction can either be wanted or unwanted

A

True

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14
Q

What is the doppler effect?

A

apparent change in pitch of a sound caused by the** movement of a sound source**

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15
Q

How is the doppler effect explained?

A

As source moves closer to the listener, the sound waves are compressed, pitch is perceived as higher because frequency increases

As sound moves by and away from the listener, the sound waves are stretched and pitch is perceived as lower because frequency decreases

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16
Q

In the doppler effect, the original sound wave is still being produced at the ______

A

same frequency

17
Q

What is an example of the doppler effect?

A

a car or train going by a stationary listener

18
Q

What is the doppler effect equation?

A

f’= f (S/S -Ss)
f’ altered frequency
f original frequency
S speed of sound
Ss speed of moving sound source

19
Q

What is the inverse square law?

A

every time the distance from the sound source is doubled, the dB decreases by 6

20
Q

T/F the inverse square law only takes place after the 1st meter

A

True

21
Q

Why does inverse square law happen

A

The farther the sound gets from the source, the energy is spread over a larger area
-this decreases the energy, decreasing the intensity

22
Q

What is a sound field

A

environment in which sound exists

23
Q

what is a Soundproof or anechoic sound feild

A

no echos

24
Q

hearing testing, we use a sound treated booth. It has a high degree of _____ and very little _______

A

absorption
reflection

25
Q

Free field

A

Idealistic environment without any obstacles or barriers

26
Q

A free field has no _____,______ or ______

A

reflection
absorption
diffraction

27
Q

A near field is within _____ meter
has no _________
no decrease in _______
and acts as a ________

A

1
inverse square law
amplitude
free field

28
Q

A far field is further than _____ meter
_____ , ______, and ______ are possible
______ applies

A

1
diffraction, absorption, reflection
inverse square law