Lesson 3 (Part 1)

Question 1

What are 4 examples of sound properties?

Answer 1

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

Question 2

What are 2 forms of waves?

Answer 2

1. Mechanical

2. Electromagnetic

Question 3

Mechanical wave (2)

Answer 3

1. Needs a medium

2. Requires a physical interaction

Question 4

Electromagnetic waves

Answer 4

Work in a medium or a vacuum

Question 5

Waves

Answer 5

Transfer energy from one location to another

- cyclical

Question 6

What are 2 forms of mechanical waves?

Answer 6

1. Longitudinal waves

2. Transverse waves

Question 7

What is an example of a longitudinal wave?

Answer 7

Sound

Question 8

Which direction do particles vibrate in a longitudinal wave?

Answer 8

Back and forth

- parallel to the direction of travel

Question 9

What direction do particles move in a transverse wave?

Answer 9

Up and down

- perpendicular to the direction of travel

Question 10

What is an example of a mechanical wave?

Answer 10

Ultrasound

Question 11

Compressional

Answer 11

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

Question 12

Rarefaction

Answer 12

Areas that are farther apart creating low pressure and low density

Question 13

What are 3 examples of acoustic variables?

Answer 13

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

Question 14

Where on the wavelength is there high density?

Answer 14

Crest

Question 15

Where on the wavelength is there low density?

Answer 15

Trough

Question 16

Where on the wavelength is the baseline?

Answer 16

Neutral

- middle

Question 17

Density

Answer 17

Concentration of matter

- high and low

Question 18

Particle motion/vibration

Answer 18

Oscillation

Question 19

What is the formula for pressure?

Answer 19

P = F/A

• P = pressure
• F = force
• A = area

Question 20

What is the unit for pressure?

Answer 20

N/m^2

- pascal (Pa)

Question 21

What is the formula for density?

Answer 21

D = M/V

• D = density
• M = mass
• V = volume

Question 22

What is the unit for density?

Answer 22

Kg/m^3

Question 23

Cycle

Answer 23

Is one complete variation in pressure/density

Question 24

What are the repetitive loops called?

Answer 24

Sinusoidal waveform

Question 25

Frequency

Answer 25

Is a measure of how often something happens over time

Question 26

What is another way to write Hz?

Answer 26

1/s

Question 27

What is another way to write KHz?

Answer 27

1/ms

Question 28

What is another way to write MHz?

Answer 28

1/us

Question 29

Infrasound

Answer 29

Is a sound of a frequency too low for human hearing

Question 30

Ultrasound

Answer 30

Is a sound of a frequency too hight for human hearing