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Flashcards in Lesson 5 Deck (32)
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1

What is strength of sound measured in? (2)

1. Amplitude (A)
2. Intensity (I)

2

What does amplitude and intensity show?

How loud the sound is

3

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

A stronger echo

4

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

A weak echo

5

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

Better quality

6

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

Poor quality

7

Amplitude

Is the maximum variation in pressure
- it is the distance from the baseline to the top/bottom of a wave (height of wave)

8

What happens to frequency and pitch with longer wavelengths?

Frequency = lower frequency
Pitch = lower pitch

9

What happens with frequency and pitch with shorter wavelengths?

Frequency = higher frequency
Pitch = higher pitch

10

What happens to sound when you have a higher amplitude?

Louder sound

11

What happens to sound when you have a lower amplitude?

Softer sound

12

What are 2 units of amplitude?

1. Pressure in Pascals (N/m^2)
2. Electrical signal/voltage (V)

13

What kind of waves transfer energy?

Mechanical

14

Power

Is the rate at which energy is transferred

15

What is the units for power?

Watts
- W or mW

16

Intensity

Is the rate at which energy passes through a unit area

17

What is the unit for intensity?

mW/cm^2

18

What is the formula for intensity?

I = P/A
- I = intensity
- P = power
- A = area

19

What happens to intensity as you decrease power?

Intensity decreases

20

What happens if you increase power?

Intensity increases

21

What happens when you decrease area?

Intensity increases

22

What does intensity depend on?

Area

23

What effects can increase power have?

Negative side effects
- eg) bioeffects

24

Focus

Is were area is the smallest
- and intensity is the highest

25

Where is the image best?

Closest to the focal point

26

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

It goes up 4x

27

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

It decreases 16 times (16x)

28

What is intensity closely related to?

Amplitude
- they are directly proportional

29

What is amplitude and intensity indicators of?

Loudness

30

What kind of form is sound?

Mechanical