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BOC studying 13

Physics

QuestionAnswer
The area of the applicator that emits ultrasound and is expressed in square centimeters is known as what? Effective radiating area
What is the frequency range of therapeutic ultrasound? 1.0 to 3.0 MHz
An object immersed in water experiences an upward force that is equal to the weight of the water displaced b the object. What law of physics is this? Archimedes' principle
A TENS unit is based on the _ of pain control Gate control theory
A pulsed current may be _ or _ Monophasic or biphasic
What is the most commonly used frequency in short-wave diathermy? 27.33 MHz
Which modality produces electromagnetic radiation with a frequency above 300 MHz and a wavelength shorter than 1 m? Microwave diathermy
Settings on a TENS unit Modulating burst continuous ramp
What kind of current is needed for iontophoresis? Direct
What is the correct definition of work? W = force x distance
To perform iontophoresis, the medication used must be _ ionized
According to joule's law, heat produced by high frequency electrical currents is directly proportional to: Square of he current strength resistance of he conductor time during which the current flows
In the application of electrotherapy, the strength of an electrical current in a circuit is directly proportional to the applied electromotive force and inversely proportional to the resistance of the current. What law is this? Ohm's
By what means does heat transfer to the skin with the used of a hot pack? Conduction
What type of waveform is produced when the current flow direction reverses on regular intervals? Alternating current
The temperature of a thermometer reading is given in degrees Celsius. What formula must be used to convert the temperature to Fahrenheit? (temperature in Celsius x 9/5) = 32
What is the impedance of an electrical circuit? The resistance within the circuit
An athlete is evaluated by the AT and it is determined he has acute supraspinatus tendinitis. What modalities would be appropriate in managing this injury? Phonophoresis iontophoresis ice packs ice massage
The strength of a current flow is known as what? Amperage
According to Poiseuille's law, the _ and _ of a blood vessel are very critical in terms of resistance to blood flow Length, radius
Which of the following intensities is considered medium intensity when treating an area with ultrasound? 0.8 - 1.5 watts per square cm
How far from the skin surface should the ultrasound transducer head be kept when utilizing the underwater technique? 0.5 to 1 inch from the skin surface
What is the polarity of an anode in an electrical stimulator? Positive
Created by: opaltafe
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