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# science

### wave hw

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

definition of a wave (vocab) | energy caused by the disturbance of the medium. |

definition of a medium. (vocab) | material through which a wave can travel. |

transverse wave. (vocab) | the particles move up and down as the wave passes. |

definition of a crest (vocab) | the highest point in the wave |

definition of a trough (vocab) | the lowest point in the wave. |

longitudinal wave (vocab) | energy is transferred from one end of an object to the other. |

compression (vocab) | particles are pushed together |

rarefraction (vocab) | particles are spread apart |

mechanical waves (vocab) | waves that require a medium |

electromagnetic waves (vocab) | waves that travel without a medium |

amplitude (vocab) | measure of how far apart particles in a medium are. |

wavelength (vocab) | distance from any point in the wave to the next identical point. |

frequency (vocab) | number of waves that pass through a certain point |

hertz (vocab) | =one wavelength per second |

wave speed (vocab) | speed that waves are traveling at |

force (vocab) | use of force to move an object some distance, measured in newtons. |

work (vocab) | push or pull exerted on an object in order to change the motion, measured in joules, force x distance=work |

power (vocab) | time it takes to get something done, efficiency and energy exerted |

if you used 5 newtons to lift a book 4 meters, how much work did you do? | 20 joules |

if I used 18 joules of work in 9 seconds, how much power did I use? | 2 watts |

if the crest of a wave moves 10 meters in 5 seconds, then the speed of the wave is? | 0.5 meters per second |

describe the relationship between wavelength and frequency. | the smaller the wavelength the higher the frequency. |

what is the speed of a wave if the frequency was 10 Hz and the wavelength is 9 mm? | 90 seconds |

what is the frequency of a wave if the speed was 7 cm/s and the wavelength was 5 cm? | 1.4 Hz |

what is the formula to find speed? | wavelength x frequency |

what is the formula to find frequency? | speed divided by wavelength. |

how can the speed o sound depend on air temperature? | if the temperature is higher there is more room for the sound particles than if the temperature is lower. |

what kind of wave does a sound wave have to be? | longitudinal |

true or false: as frequency increases, wavelength decreases. | true |