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Physics 1 > Lesson 6 > Flashcards

Lesson 6 Flashcards

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1
Q

What allows attenuation to occur? (3)

A
  1. Absorption
  2. Reflecting
  3. Scattering
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2
Q

What is absorption?

A

The transfer of sound to heat

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3
Q

What makes up an image? (2)

A
  1. Reflecting

2. Scattering

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4
Q

What does 0dB mean?

A

You cant hear anything

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5
Q

What happens as decibels get higher?

A

It gets louder

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6
Q

What does 3dB mean?

A

2x

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7
Q

What does 10dB mean?

A

10x

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8
Q

What is the unit for attenuation?

A

Decibels

- dB

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9
Q

What do decibels describe?

A

The relationship between various measured sound levels

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10
Q

What is the formula for attenuation?

A 
a = ac x L
a = attenuation 
ac = attenuation coefficient 
L = length traveled
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11
Q

Attenuation coefficient

A

Attenuation that occurs with each cm the sound travels

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12
Q

What is the unit for attenuation coefficient?

A

dB/cm

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13
Q

What is attenuation depend on? (3)

A
  1. Type of tissue
  2. Length/distance of travel
  3. Frequency
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14
Q

What does it mean when your image is more fuzzy?

A

Less sound is traveling through

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15
Q

How much sound goes through bone?

A

None

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16
Q

What structures have high attenuation? (4)

A
  1. Bone
  2. Stomach
  3. Lungs
  4. Fatty liver
17
Q

What structures have low attenuation? (2)

A
  1. Normal liver

2. Bladder

18
Q

What is ac in soft tissues?

A

Half of the frequency

- 0.5 x freq. x length

19
Q

What happens to attenuation if frequency increases?

A

It increases

20
Q

What happens to attenuation if distance increases?

A

It increases

21
Q

What are 5 forms of energy?

A
  1. Heat
  2. Light
  3. X-rays
  4. Microwaves
  5. Mechanical motion
22
Q

What happens to attenuation if the coefficient increases?

A

It increases

23
Q

What happens to penetration if frequency increases?

A

It decreases

24
Q

Attenuation

A

Weakening of sound

Physics 1 (42 decks)

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