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# Ch 3 RAD 150

### Electromagnetic Energy

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

Electromagnetic energy exists over a wide range called an energy _____. | continuum |

An x-ray photon is a ____ of electromagnetic energy. | quantum |

_____ _______ showed that visible light has both electric and magnetic properties. | James Maxwell |

The velocity of all electromagnetic radiation is _______. | 3x10 to the eighth m/s |

Simplistically, sine waves are variations of _____ over time. | amplitude |

_______ is one half the range from crest to valley over which the sine wave varies. | Amplitude |

One hertz (Hz) is equal to __ cycle per second. | one |

_______ is the number of wavelengths that pass a point of observation per second. | Frequency |

As frequency increases, wavelength will ______. | decrease |

Wavelength is represented by the greek letter _____. | lambda |

Frequency is expressed in _____; wavelength (lambda) is expressed in _____. | hertz; meters |

A photons energy is directly proportional to its ______. | frequency |

The ____ _____ ____ applies to all electromagnetic radiation. | inverse square law |

The ______ is the distance from one crest another, from one valley to another or from any point on the sine wave to the next corresponding point. | wavelength |

As the velocity decreases, the _____ decreases proportionately. | frequency |

At a given velocity, wavelength and ______ are inversely proportional. | frequency |

The _____ range of electromagnetic energy extends from approximately 10 (2) to 10 (24) Hz. | frequency |

The deviation of light when it passes from one transparent medium to another is called _____. | refraction |

_________ have low energies and long wavelengths. | Radio frequencies |

Microwave radiation has a ____ wavelength. | short |

The only difference between x-rays and gamma rays is their _____. | origin |

X-rays are emitted from the _______, while gamma rays come from inside the ____ of a radioactive atom. | electron cloud; nucleus |

The phenomenon in which light and x ray photons behave like particles and waves is called _____ ______. | wave-particle duality |

Electromagnetic energy _______ is the reduction in intensity that results from scattering and absorption. | attenuation |

What are the three degrees of interaction between light and an absorbing material? | transparency, translucency and opacity |

Structures that absorb x rays are called _____. | radiopaque (bone) |

Structures that transmit x rays are called ______. | radiolucent (lungs) |

Radiation intensity is ______ related to the square of the distance from the source. | inversely |

The inverse square law can be applied to distanced greater than ___ times the longest dimension of the source. | seven |

X ray energy ranges from __ keV to __ MeV | 10 - 50 |

What is Planck's Quantum equation? | E=hf |

Planck's constant is symbolized by the letter __ and has a numeric value of ____ eVs. | h; 4.15 x 10 (-15) |

The longer the wave length of electromagnetic energy, the ____ the energy of each photon. | lower |

Which law states that matter can be neither created nor destroyed? | Law of conservation of matter |

Which law states that energy can be neither created nor destroyed? | Law of conservation of energy |

_____ _____ is an example of converting matter into energy. | Nuclear fission |

One ____ is equal to 6.24 x 10 (18) eV | Joule |

What is the wave equation? | velocity= frequency x wavelength |

What is the electromagnetic wave equation? | constant=frequency x wavelength (lambda) f=c/wavelength wavelength=c/f |

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