Lesson 3 (Part 2) Flashcards Preview

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Flashcards in Lesson 3 (Part 2) Deck (18)
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1

Period

Is the time it takes for one cycle to occur

2

What is the unit for a period?

us

3

What is the formula for period?

T = 1/f
- T = period
- f = frequency

4

What happens to the period if frequencies increases?

Period decreases

5

What relationship does period and frequency have?

Inversely proportional relationship

6

Wavelength

Is the physical length of one cycle
- cycle length

7

What is the formula for wavelength?

lambda = c/f
- lambda = wavelength
- c = propagation speed
- f = frequency

8

What is the units for wavelength?

mm

9

What is the term for speed of sound?

Propagation speed
- acoustic velocity

10

What are the units for propagation speed? (2)

1. m/s
2. mm/us

11

What is the propagation speed of soft tissue? (2)

1. 1540m/s
2. 1.54 mm/us

12

Where is propagation speed highest?

In solids

13

Where is propagation speed lowest?

In gases

14

What happens to the propagation speed if compressibility increases?

It increases

15

What happens to the propagation speed if the elasticity goes up?

It decreases

16

What is propagation speed based on?

Medium
- and only medium

17

Stiffness

Is the resistance to compression

18

What is the formula for propagation speed? (2)

1. c =|B/p
- c = propagation speed
- | = square root
- B = bilk modulus (stiffness)
- p = density
2. c = lambda x f
- lambda = wavelength
- frequency