Fisika Dasar I Per.20

Fisika Dasar I Umiatin, M.Si ,[object Object],[object Object]

Characteristics of waves ,[object Object],The frequency of a wave tells how often each point oscillates. The amplitude of a wave is the maximum movement from equilibrium. The wavelength of a wave is the length of one complete cycle. 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],transverse waves: waves in a string etc. longitudinal waves: sound waves etc. waves in water etc. 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

Types of mechanical waves Longitudinal and transverse waves sound wave = longitudinal wave C = compression R = rarefaction air compressed air rarefied 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

Mathematical description of a wave ,[object Object],[object Object],[object Object],[object Object],sinusoidal wave moving in +x direction angular frequency velocity of wave, NOT of particles of the medium wavelength period sinusoidal wave moving in -x direction v->-v phase velocity 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

[object Object],wave number: The speed of wave is the speed with which we have to move along a point of a given phase. So for a fixed phase, phase phase velocity 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

Speed of a transverse wave ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Newton’s 2 nd law mass acceleration 11/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

Fisika Dasar I Per.20

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