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# physics 4&5

Question | Answer |
---|---|

an xray photon is a quantum of what | electromagnetic energy |

what is another name for a photon | quantum |

how is energy related to its frequency | directly |

what are the 4 properties of a photon | frequency, wavelength, velocity and amplitude |

what does the symbol C represent | velocity 3x10^8 m/s |

what is the rate of the rise and fall of a sine wave | frequency |

what is the range fom crest to valley called in a sine wave | amplitude |

wht is the number of wavelengths that pass a point of observation per second | frequency |

how is frequency measured | hertz |

wavelength and frequency are________ proportional | inversely |

reduction in intensity that results from scattering and absorption | electromagnetic energy attenuation |

why is the intensity of radiation reduced with distance | because it is spread out over a greater distance |

photon energy is ______proportional to its frequency | directly |

what is planck's constant | 4.15x10^-15 |

what is planck's equation | E=HF E-energy, H-planck"constant, F-frequency |

what is the diagnostic xray range | 30-150 kvp |

what is the research range | <10kvp |

matter can be transformed into _____ and energy can be transformed into_____ | energy, matter |

what is the relativity formula | E=MC^2 |

waht is the highest range of energy | gamma rays |

what is the lowest range of energy | radiowaves |

wht type of rays are produced in the nucleus of the atom | gamma rays |

what type of rays are produced outside of the nucleus | xrays |

when will photons act with matter most easily | when the matter is close tto the same size of the photon wavelength |

what is the study of stationary electric charges | electrostatics |

what is the smallest unit of electrical charges | electron |

electrification occurs through the movement of what | electron |

what are the electrostatic laws | unlike charges attract and like repel/ electric is uniform or throughout the surface/ electric charge of a conductor is concentrated along the sharpest curvature of the surface |

what is coulombs law | the electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them |

what is the study of electric charges in motion | electrodynamics |

what is the substance in which electrons flow easily | conductor (metals, water, copper being the best |

what does not allow electrons to flow easily | insulators (glass, clay, and other earthlike materials) |

what acts as a insulator or conductor depending on the conditions | semiconductor (silicon, germanium |

waht are the conditions that cause a semiconductor to act as a insulator or conductor | temperature |

what happens to current when resistance to electric increases | reduces the current |

what is an electric current | controlled resistance in a conductor, and the conductor is a closed path |

What is the formula for ohms law | V=IR V=volts or electrical potential I=electrical current or amps and R=electric resistance or ohms |

what is a series circuit | all circuit elements are connected on a line of the same conductor |

what is a parallel circuit | elements are connected at the ends rather than lying on a line of a conductor |

what is a current | flow of electrons through a conductor |

what is a D/C current | direct current and produced by a baattery and the electrons flow in one direction |

what is a A/C current | current produced by a generator. electrons flow alternately in opposite direction (basically anything that has to be plugged in) |

in the US how long does it take a A/C to go through a complete cycle | 1/60 second |

how is the electrical charge distributed | evenly throughout |

where do charges concentrate on a electrified object | sharpest curvature |

volt is the unit of | electric potential |

voltage is another name for what | electric potential |

electric power is measured in | watts |

what is required for common household appliances | 500-1500 watts |

what does a charged particle in motion create | magnetic field |

what is magnetism measured in | tesla |

the lines of a magnetic field are always | closed loops |

what is accumulation of dipoles | magnetic domain |

lines of magnetic field that do not start or end | bipolar |

small magnet created by the electron orbit | dipole |

natural magnet | earth |

water and plastic are examples of what type of magnetic material(repelled by either pole) | diamagnetic |

magnetic material that is strongly attracted when placed in a external magnetic field | ferromagnetic |

magnetic material that is slightly attracted by external magnetic field | paramagnetic |

what is a solenoid | coil of wire |

what changes the intensity of alternating voltage and current | transformer |

sinusoidal fashion | wavelike |

three imaging windows | xray imaging, visual imaging, MR imaging |

what wattage do light bulbs require | 30 to 150 |

what wattage do xray machines require | 20 to 150 |

what is the older SI unit of magnetic field strength | guass |

the magnitude of the induced current depends on four factors | faradays law |

four factors of faradays law | the strength of the magnetic field velocity of the magnetic field as it moves past the conductor angle of the conductor to the magnetic field number of turns in conductor |

an electric current is induced in a circuit if some part of that circuit is in a changing magnetic field | electromagnetic induction |

what changes the intensity of alternating voltage and current | transformer |

what has one winding and varies both voltage and current | autotransformer |

what are variations of amplitude over time | sine waves |

wave equation | wavelength= velocity/frequency |

electromagnetic wave equation | velocity=frequency x wavelength |

structures that absorb xray | radiopaque |

structures that transmit xray | radiolucent |

electrification can be created by what | contact, friction, induction |

resistance decreases as the temperature of material_________ | reduced |

the property of some material to exhibit no resistance below a critical temperature | superconductivity |

any charged particle in motion creates a | magnetic field |

what can be made into magnets by induction | ferromagnets |

electric potential is measured in what | joules per coulomb, or volt |

current carrying coil of wire wrapped around an iron core, which intensifies the induced magnetic field | electromagnet |

Created by:
subee61