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# Bushong 4,5

### ch 4, 5 bushong

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

The photon is the smallest type of ________ __________? | electromagnetic radiation |

What are the 4 properties of a photon? | wavelength, frequency, amplitude, velocity |

What is the rate of the rise and fall of a sine wave called? | frequency |

What is the electromagnetic wave equation? | C=Fλ |

This is always constant for electromagnetic radiation? | velocity |

1 cycle per second is equal to 1 ______. | hertz |

What is the frequency of all electromagnetic radiation? | 3x10^8m/s |

If the frequency of electromagnetic radiation is decreased by 1/2, then the wavelength must be ________. | doubled |

If the wavelength of electromagnetic radiation is increased by 2, then the frequency must be decreased by ____? | 1/2 |

The intensity of radiation ______ in ________ proportion to the square of the distance of the object from the source? | decrease, inverse |

What does the last question describe? | The inverse square law |

Wavelength and frequency are ______ proportional. | inversely |

How is the inverse square law written? | I1/I2= (D2)2/(D1)2 |

Why is the intensity of radiation reduced with distance? | Because it has to spread out over a greater distance |

Reduction in intensity that results in scattering and absorption is called? | attenuation |

What is the diagnostic range of x-rays? | 30 to 150 kVp |

If you are given an answer in KeV, then what formula did this originate from? | relativity formula |

Photon energy is ______ proportional to its frequency? | directly |

How are x-rays usually identified? | by their energy |

How is the relativity formula written? | E=MC2 |

What is the lowest range of electromagnetic energy? | radio waves |

What is the highest range of electromagnetic energy? | gamma rays |

When will photons interact with matter most easily? | when they are equal in size |

Where are gamma rays produced? | in the nucleus |

What is the smallest unit of electrical charge? | electron |

Electrification occurs through the movement of ________. | electrons |

Photons with the lowest frequency have the ________ wavelength. | longest |

Photons with the _________ frequency have the shortest wavelength. | highest |

Unlike charges _______, while like charges ________. | attract, repel |

The charges of an electrified object are distributed __________________. | evenly throughout |

Name the 3 electrostatic laws. | Unlike charges attract, like charges repel; electric is uniform or throughout the surface; electric charges are strongest on the sharpest curvature of the surface |

Volts are the unit of what? | electric potential |

Electric power is measured in _______. | watts |

A battery is an example of which type of current? | direct |

Anything that can be plugged in is an example of which type of current? | alternating |

What is Ohm's Law? | V=IR I=V/R R=V/I |

AC is represented by what symbol? | sinusoidal line |

When applying an electric potential to a conductor, it produces what? 2 answers | an electric current, and a magnetic field |

How is an electrical charge distributed? | evenly throughout |

What produces an alternating current? | a generator |

In Coulombs Law, it states an electrostatic force is ________ proportional to the product of electrostatic charges and _________ proportional to the square of the distance between them. | directly, inversely |

Charged particles in motion create a(n) ___________. | magnetic field |

Name 2 examples of insulators. | rubber, glass |

In the USA, alternating current goes through a cycle ever ________ of a second. | 1/60 |

What is the SI units for magnetic field strength? | Tesla |

What is an example of a series circuit? | A string of Christmas lights |

Water and plastic are examples of what type of magnetic material? | Diamagnetic |

When a material that is strongly attracted to metal is placed in an external magnetic field, it is said to be ________________. | ferromagnetic |

When electrons rotate on their axis creating a magnetic field? | electron spin |

Accumulation of aligned dipoles is called? | magnetic domain |

The magnetic force is ___________ to the product of the magnetic pole strengths divided by the ________ of the distance between them. | proportional, square |

What does adding a copper core to a solenoid do? | intensifies the magnetic field |

What is considered a natural magnet? | the earth |

What would be an example of a non magnetic material? | wood and glass |

What type of motor powers the rotating anode? | induction |

What does a transformer do? | changes the intensity of alternating voltage and current |

How many windings does the autotransformer have? | 2 winding |

Created by:
radgirl37
on 2011-02-10