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Physics 1 > Lesson 5 > Flashcards

Lesson 5 Flashcards

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1
Q

What is strength of sound measured in? (2)

A
  1. Amplitude (A)

2. Intensity (I)

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2
Q

What does amplitude and intensity show?

A

How loud the sound is

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3
Q

If you have a stronger ultrasound pulse, what will it produce?

A

A stronger echo

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4
Q

If you have a weaker ultrasound pulse, what will it produce?

A

A weak echo

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5
Q

What kind of image do you get with a stronger echo?

A

Better quality

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6
Q

What kind of image do you get with a weaker echo?

A

Poor quality

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7
Q

Amplitude

A

Is the maximum variation in pressure

- it is the distance from the baseline to the top/bottom of a wave (height of wave)

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8
Q

What happens to frequency and pitch with longer wavelengths?

A 
Frequency = lower frequency 
Pitch = lower pitch
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9
Q

What happens with frequency and pitch with shorter wavelengths?

A 
Frequency = higher frequency 
Pitch = higher pitch
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10
Q

What happens to sound when you have a higher amplitude?

A

Louder sound

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11
Q

What happens to sound when you have a lower amplitude?

A

Softer sound

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12
Q

What are 2 units of amplitude?

A
  1. Pressure in Pascals (N/m^2)

2. Electrical signal/voltage (V)

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13
Q

What kind of waves transfer energy?

A

Mechanical

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14
Q

Power

A

Is the rate at which energy is transferred

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15
Q

What is the units for power?

A

Watts

- W or mW

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16
Q

Intensity

A

Is the rate at which energy passes through a unit area

17
Q

What is the unit for intensity?

A

mW/cm^2

18
Q

What is the formula for intensity?

A

I = P/A

  • I = intensity
  • P = power
  • A = area
19
Q

What happens to intensity as you decrease power?

A

Intensity decreases

20
Q

What happens if you increase power?

A

Intensity increases

21
Q

What happens when you decrease area?

A

Intensity increases

22
Q

What does intensity depend on?

A

Area

23
Q

What effects can increase power have?

A

Negative side effects

- eg) bioeffects

24
Q

Focus

A

Is were area is the smallest

- and intensity is the highest

25
Q

Where is the image best?

A

Closest to the focal point

26
Q

If you double amplitude (2x), what happens to the intensity?

A

It goes up 4x

27
Q

If you decrease amplitude 4 times (4x), what happens to the intensity?

A

It decreases 16 times (16x)

28
Q

What is intensity closely related to?

A

Amplitude

- they are directly proportional

29
Q

What is amplitude and intensity indicators of?

A

Loudness

30
Q

What kind of form is sound?

A

Mechanical

31
Q

What is the beam area determined by?

A

The transducer

32
Q

What is intensity proportional to?

A

Amplitude^2

  • eg) amp is doubled, intensity is 4x
  • eg) amp is halved, intensity ia 1/4x

Physics 1 (42 decks)

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