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# Ch 4 Physics

### Electromagnetic Energy

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

What are the electromagnetic properties? | frequency, wavelength, velocity, amplitude |

What formulas are used to describe how electromagnetic energy behaves? | wave equation, inverse square law |

A field or state of energy found all around us. Also found in x-rays, radiowaves, microwaves, and visible light is called: | electromagnetic energy |

An uninterrupted (continuous) ordered sequence of energy that exist over a wide range. | continuum |

The smallest quantity of any type of electro-magnetic energy. | photon |

The photon, a small bundle of energy that travels through space at the speed of light, is also referred to as a: | quantum |

Velocity, or speed of light, is equal to what? | 186,000 miles per second |

What is the SI unit for velocity (speed of light)? | 3 x 10^8 m/s |

Do photons have mass? | no |

Do photons have electrical and magnetic fields? | yes |

A variation in the movement of photons in electrical and magnetic fields. | sinewave |

The gravitational field that governs the interaction of electrostatic charges is the: | electric field |

The gravitational field that governs the interaction of magnetic poles is the: | magnetic field |

Oscillation of electricity in both directions within a conductor. | alternating current |

Flow of electricity in one direction within a conductor. | direct current |

One-half the range from crest to valley over which the sine wave varies refers to the: | amplitude |

The number of wavelengths that pass a point of observation per second; rate of rise and fall. | frequency |

What is the measurement of frequency? | hertz (Hz) |

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

The three wave parameters needed to describe electromagnetic energy are: | velocity, frequency, wavelength |

Created by:
Beverly Jo Miller-Cox