Midterm Sound

Question 1

What does sound require

Answer 1

Vibrating source, medium

Question 2

What must the source and medium of sound have

Answer 2

Mass- amount of matter present

Elasticity- ability to recover from distortion

Question 3

Types of waves

Answer 3

Transverse

Longitudinal

Question 4

Transverse waves

Answer 4

Up & down

Question 5

Longitudinal waves

Answer 5

Parallel to length
Each particle vibrates back and forth causing a propagation of the condensation (dec in density between particles) and rarefaction (inc density)
Each air particle does work on the next
Sound

Question 6

Harmonic motion

Answer 6

As projected uniform circular motion

Sine wave

Question 7

Dimensions of a sine wave

Answer 7

Amplitude
Frequency
Phase
Wavelength

Question 8

Decibel

Answer 8

Measurement of power (amplitude) of sound
1/10th of a bel
Based on log scale
Used to measure intensity and pressure

Question 9

Sound pressure level

Answer 9

The number of decibels above or below a reference pressure of 20 microPascals

Question 10

Hearing level

Answer 10

The number of dB above or below audiometric zero

Question 11

Sensation level

Answer 11

The number of dB above or below an individual’s hearing threshold