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# Peters Ch. 25 vocab

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

1. vibration | a repeating back and forth motion about na equilibrium position |

2. wave | a disturbance that is transmitted progressivly from one place to the next with no actual transport of matter |

3. period | the time of the back and forth swing of the pendulum |

4. simple harmonic motion | the back and forth vibratory motion of a swinging pendulum |

5. sine curve | pictorial representation of a wave |

6. crest | the high points on a wave |

7. trough | the low points on the wave |

8. amplitude | the distance from the mmidpoint to the crest of the wave. is the maximum displacement from equilibrium |

9. wavelength | the distance from the top of one crest to the top of the next one |

10. frequency | the number of vibrations an object makes ina unit of time . |

11. hertz | the unit of frequency |

12. transverse wave | a wave with vibration at right angles to the direction the wave is traveling |

13. longitudial wave | a wave in which the vibration is in the same direction as that in which the wave is traveling, rather than at right angles to it |

14. interference wave | a pattern formed by the overlapping of two or more wavesthat arrive in a region at the same time |

15. constructive interference | addition of two or more waveswhen wave crests overlapto produce a resulting waveof increased amplitued |

16. destructive interference | combination of waves where crests of one wave overlap troughs of another, resulting in a wave of decreased amplitued |

17. out of phase | term applied to two waves for which the crest of one wave arrives at a point at the same time that a trough of the second wave arrives. there effects cancel each other |

18. in phase | term applied to two or morewaves whose crests (and troughs) arrive at a place at the same time, so that their effects reinenfore each other. |

19. standing wave | wave in which parts of the wave remainstationary and the wave appears not to be traveling. the result of interference between an incident ( an original ) wave and reflected wave. |

20. Node | a part of a wave that remains stationary |

21. antinodes | the positions on a standing wave where the largest amplitudes arrive |

22. doppler effect | the apperant change in freuquency of a wave dua to the motion of the source or of the reciever |

23. blue shift | increase in frequency |

24. red shift | decrease in frequency |

25. bow wave | when crests overlap at the edges, the pattern made by these overlapping crest in a V shape |

26. shock wave | a three-dimensional wavethat consistsof overlapping spheres that form a cone |

27. sonic boom | the sharp cracked heardwhen the shock wave that sweepsbehind a supersonic aircraft reaches the listeners, this is what we hear. |