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# Carnegie Physics 1

### Basics/Intro to Sound

TermDefinition
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