# Shared Flashcard Set

## Details

waves and sound
Kamm Phys 1114
18
Physics
05/10/2009

Term
 Period
Definition
 the time it takes for one complete oscillation in seconds
Term
 frequency
Definition
 the number of oscillations in unit time in hertz
Term
 define and give an example of a transverse wave
Definition
 a wave whose vibration direction is perpendicular to the wave direction; microwave
Term
 define and give an example of a longitudinal wave
Definition
 a wave whose vibration direction is parallel to the wave direction; sound waves in air
Term
 Give the perceptual variable which corresponds to frequency
Definition
 pitch
Term
 Give the perceptual variable which corresponds to intensity
Definition
 loudness
Term
 Give the perceptual variable which corresponds to harmonics
Definition
 timbre
Term
 give the range for human hearing
Definition
 20 hz-20,000 hz
Term
 Io=
Definition
 Io= 1E-12 W/m2
Term
 Define resonance
Definition
 All vibrational systems have a natural frequency of oscillation. Energy is added using a "driver". When the frequency of the driver matches the natural frequency, an increase in vibration amplitude occurs.
Term
 Describe one medical diagnostic technique which uses ultrasound.
Definition
 Pulse-doppler: High frequency sound wave pulses are directed into the body at moving fluids (blood). The frequency shift of the reflected pulses is used to calculate flow velocity. Frequency: 1-20 MHz Maximum Intensity: 15.7 W/cm2 Pulse length: 0.3-10 microseconds
Term
 Describe one medical treatment technique which uses ultrasound
Definition
 Physiotherapy: High frequency sound waves are directed into the body where they are absorbed and converted into thermal energy. The increase in tissue temperature reduces pain, accelerates healing, and reduces swelling. Frequency: 0.5-3Mhz Maximum Intensity: 2.5 W/cm2 Pulse length: 2-8 milliseconds
Term
 Give the formula for the doppler effect
Definition
 F=F'(v)/(v(+/-)s)
Term
 Give the formula for loudness in decibals
Definition
 Loudness=(10)log I/1E-12
Term
 Equation for the period of a spring mass oscillation
Definition
 T=(2)(Pi)(square root of mass over K)or T=2Pi(square root of x/g)(K=F/X) (F=mg)
Term
 Equation for the period of a pendulum
Definition
 T=2Pi(Square root L/G)
Term
 equation for speed of sound
Definition
 V=lambda*frequency lambda= wavelength in meters
Term
 State the superposition principal
Definition
 When two or more waves meet in time and space, the result is the simple sum of the individual dispacements.
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