Lesson 3 (Part 1) Flashcards Preview

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Flashcards in Lesson 3 (Part 1) Deck (30)
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1

What are 4 examples of sound properties?

1. Frequency
2. Period
3. Wavelength
4. Propagation speed

2

What are 2 forms of waves?

1. Mechanical
2. Electromagnetic

3

Mechanical wave (2)

1. Needs a medium
2. Requires a physical interaction

4

Electromagnetic waves

Work in a medium or a vacuum

5

Waves

Transfer energy from one location to another
- cyclical

6

What are 2 forms of mechanical waves?

1. Longitudinal waves
2. Transverse waves

7

What is an example of a longitudinal wave?

Sound

8

Which direction do particles vibrate in a longitudinal wave?

Back and forth
- parallel to the direction of travel

9

What direction do particles move in a transverse wave?

Up and down
- perpendicular to the direction of travel

10

What is an example of a mechanical wave?

Ultrasound

11

Compressional

When areas are closer together creating high pressure and a high density

12

Rarefaction

Areas that are farther apart creating low pressure and low density

13

What are 3 examples of acoustic variables?

1. Pressure
2. Density
3. Particle motion/vibration

14

Where on the wavelength is there high density?

Crest

15

Where on the wavelength is there low density?

Trough

16

Where on the wavelength is the baseline?

Neutral
- middle

17

Density

Concentration of matter
- high and low

18

Particle motion/vibration

Oscillation

19

What is the formula for pressure?

P = F/A
- P = pressure
- F = force
- A = area

20

What is the unit for pressure?

N/m^2
- pascal (Pa)

21

What is the formula for density?

D = M/V
- D = density
- M = mass
- V = volume

22

What is the unit for density?

Kg/m^3

23

Cycle

Is one complete variation in pressure/density

24

What are the repetitive loops called?

Sinusoidal waveform

25

Frequency

Is a measure of how often something happens over time

26

What is another way to write Hz?

1/s

27

What is another way to write KHz?

1/ms

28

What is another way to write MHz?

1/us

29

Infrasound

Is a sound of a frequency too low for human hearing

30

Ultrasound

Is a sound of a frequency too hight for human hearing