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Carnegie Physics 1
Basics/Intro to Sound
| Term | Definition |
|---|---|
| Measurement of Wavelength | milimeters |
| Measurement of Propagation Speed | meters/sec |
| Measurement of Frequency | Hertz |
| Measurement of Period | Seconds (time) |
| Measurement of Intensity | Watts/cm^2 |
| Measurement of Power | Watts |
| Is Frequency and Period Direct, Inverse or Unrelated? | Inverse |
| Is wavelength and velocity direct, inverse or unrelated? | Direct |
| Is amplitude and intensity direct, inverse or unrelated? | Direct |
| is frequency and depth of penetration direct, inverse or unrelated? | Inverse |
| Is crystal thickness and amplitude direct, inverse or unrelated? | Unrelated |
| Is voltage to crystal and period of wave direct, inverse or unrelated? | Unrelated |
| Is propagation speed and density of medium direct, inverse or unrelated? | Inverse |
| Is frequency direct, inverse or unrelated to wavelength? | inverse |
| is frequency direct, inverse or unrelated to crystal thickness? | inverse |
| What is wavelength? | Distance/length of one complete cycle |
| What is the typical value of wavelength? | 0.15-1.8mm |
| True or False; Wavelength can be adjusted by operator | False |
| What is intensity? | Concentration of energy in a sound beam. Depends on both power in the beam and area over which the power is supplied. |
| What are the typical values of intensity? | 0.01-300 W/cm^2 |
| True or False; Intensity can be adjusted by the operator | True |
| What is power? | The rate of energy transfer or rate at which work is performed. "Bigness of wave" |
| What are the typical values of power? | 4-90 miliwatts |
| True or False; Power can be adjusted by the operator | True |
| What is amplitude? | The difference between the minimum value and the average value of the acoustic variable. "Bigness of wave" |
| What are the typical values of amplitude? | 1 million-3 million pascals (1-3 MPa) |
| Can amplitude be adjusted by the operator? | Yes |
| What is frequency? | Number of cycles that occur in one second |
| What are the typical values of frequency? | 2 MHz - 10MHz |
| Can frequency be adjusted by the operator? | No |
| What is a Period? | The time from the start of a cycle to the start of the next cycle |
| What are the typical values of a Period? | 0.1-0.5 microseconds |
| Can the Period be adjusted by the operator? | No |
| What is propagation speed? | The distance that a sound wave travels though a medium in 1 second |
| What is the typical value of propagation speed? | 1.54 x10^3 |
| Can propagation speed be adjusted by the operator? | No |
| True or False; Propagation speed decreases as frequency increases | False, unrelated |
| True or Flase; Wavelength can be described as Long or Short | True |
| Sound waves are; | Longitudinal and Mechanical |
| What term describes the properties of the medium that affect the wave? | Acoustic Variables |
| The area of highest density in a wave occurs where? | Compression |
| Pressure is measured in what? | Pascal |
| The inverse of frequency is what? | Period |
| The alignment of positive and negative charges in a piezoelectric crystal is call what? | Dipole |
| Where is the compression phase on a sine wave? | Crest |
| Where is the rarefaction phase on a sine wave? | Trough |
| True or False; Amplitude increases as it travels through a medium | False, decreases |
| Electronic device for converting one form of energy into another is a what? | Transducer |
| Absorption is the loss of ultrasound intensity in what form? | Heat |
| Where odes the piezoelectric effect occur? | Transducer |
Created by:
ICVT55
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