Term
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Definition
| the time it takes for one complete oscillation in seconds |
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Term
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Definition
| the number of oscillations in unit time in hertz |
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Term
| define and give an example of a transverse wave |
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Definition
| a wave whose vibration direction is perpendicular to the wave direction; microwave |
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Term
| define and give an example of a longitudinal wave |
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Definition
| a wave whose vibration direction is parallel to the wave direction; sound waves in air |
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Term
| Give the perceptual variable which corresponds to frequency |
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Definition
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Term
| Give the perceptual variable which corresponds to intensity |
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Definition
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Term
| Give the perceptual variable which corresponds to harmonics |
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Definition
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Term
| give the range for human hearing |
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Definition
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Term
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Definition
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Term
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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. |
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Term
| Describe one medical diagnostic technique which uses ultrasound. |
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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 |
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Term
| Describe one medical treatment technique which uses ultrasound |
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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 |
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Term
| Give the formula for the doppler effect |
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Definition
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Term
| Give the formula for loudness in decibals |
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Definition
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Term
| Equation for the period of a spring mass oscillation |
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Definition
T=(2)(Pi)(square root of mass over K)
or T=2Pi(square root of x/g)
(K=F/X) (F=mg) |
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Term
| Equation for the period of a pendulum |
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Definition
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Term
| equation for speed of sound |
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Definition
| V=lambda*frequency lambda= wavelength in meters |
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Term
| State the superposition principal |
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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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