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Barbs quizzes physic
Bushong ch 2, 4, 5, 6, 7
| Question | Answer |
|---|---|
| The 4 properties of photons are what | Freq, wavelength, velocity and amplitude |
| The smallest quanitity of any type of EM radiation is what | Photon |
| The rate of rise and fall of a sine wave is called what | Frequency |
| A hertz Hz is = to | 1 cycle per second |
| If the wavelength of a beam is EM radiation increases by a factor of 2, then its frequency must.. | decrease by half |
| The reduction of radiation intensity due to scattering and absoprtion is called what | attenuation |
| The intensity of radiation on an object is reduced with distance b/c the radiation is | spread out over a greater area |
| The diagnostic range of xray energy is | 30 to 150 kVp |
| The energy of a photon is directly proportional to its | frequency |
| Gamma rays are produced in the ____ of the atom | Nucleus |
| The smallest unit of electrical charge is the | electron |
| Electrification occurs through the movement of | electrons only |
| On the surface of an electrified object, the charges concentrate on | the sharpest curvatures |
| What is a source of direct current | Battery |
| What is the unit of electric potential | Volt |
| An alternating current is represented by a ____ line | Sinusoidal |
| What is Ohms law | I=V/R |
| Electrical power is measured in | Watts |
| What type of material can be made magnetic when placed in an external magnetic field? | Ferromagnetic |
| The operating console contains circuits that are... | low voltage only |
| Variations in power distribution to the xray machine are corrected by... | Line voltage compensator |
| The ___ filament circuit provides electrons for the xray tube current | Filament |
| The most accurate type of timer is what | Electronic timer |
| The step up transformer increases voltage ____ times | 500-1000 |
| The difference in the waveform b/t the primary and secondary sides of the high voltage transformer is the ___ | Amplitude |
| Full wave rectified, 3 phase units provide an xray beam at ___ per second | 360 pulses |
| A single phase waveform has ____ ripple | 100% |
| The principal disadvantage of 3 phase equipment is | cost |
| What is the industry standard forumula for calculating high voltage generator power? | P=max mA.....x100kvp |
| The most widley used support structure for the xray tube is the | Ceiling support system |
| What is the most common cause of tube failure | Tungsten vaporization |
| Thermionic emission at the filament creates a ____ | Space charge |
| The _____ is the source of radiation in the xray tube. | Focal Spot |
| The xray intensity is lower on the anode side of the tube b/c of the _____ | Heel effect |
| Tube failure can occur from | Long exposure times |
| A dual focus tube has 2 | filaments |
| Each tube has its own tube rating chart to show | Max exposure times |
| Extrafocal radiation or off focus rad is produced from | Rebounding electrons |
| Localized pitting or cracking on the anode can occur from | A single excessive exposure |
| The basic quanitites measured in mechanics are | mass, length, time |
| What is the standard unit of mass | Kg |
| What is the equation for velocity | v=d/t |
| The velocity of light is written as | c=3x10 8 m/s |
| Momentum is the product of the | mass of an object and its velocity |
| Work formula | W=Fd |
| The unit for work is the | Joule |
| ____ is the kinetic energy of the random motion of molecules | Heat |
| An xray tube cools primarily through the process of | Radiation |
| Thermal radiation is the transfer of heat throught the emission of | Infrared radiation |
Created by:
rachelbeatty4