Three “Bigness"
Power
Power
the rate of energy transfer
What is power?
the concentration of energy in sound beam
What is intensity?
Symbol
What is ^
Propagation Speed
What is the rate at which sound travels through a medium?
Pulse duration
What time does it take for one pulse to occur?
Watts (think of lightbulb)
What is the unit of power?
Unit of intensity
What are watts/cm^2?
Typical US value
What is typical US value: 0.1 mm to 0.8 mm
Symbol for propagation
What is C
Abbreviation
PD
4 to 90 mW
What is typical US valu?
Typical US value
What is 0.01 to 300 W/cm^2
Formula for wavelength
^(mm) = c(mm/us) / f(MHz)
Unit for propagation speed
What is m/s, mm/us
Unit
What are Microseconds (us)?
Power is determined by
What is Source (weakens as it travels)?
Formula intensity
What is (w/cm^2) = power(W) / area (cm^2
Unit
What is mm?
Propagation speed is determined by
What is by Medium?
Typical US value for pulse duration
What is 0.3 us to 2 us
Is power adjustable
What is YES?
Squared always follows
What is Amplitude
(Intensity is related to the amplitude squared)
Wavelengths can be adjusted
What is NO?
Typical US valve of propagation speed
What is typical US valve: 500 m/s to 4000m/s
Pulse duration formula
What is #cycles x period