Stationary Waves

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Cards (8)

  • Stationary waves are formed when 2 progressive waves with the same frequency travelling in opposite directions superpose.

    They do not transfer energy, they store it
  • Stationary waves are formed when two waves travelling in opposite directions with the same frequency + amplitude, reflected of a fixed end, superpose creating nodes and antinodes
  • Antinode: Point of maximum amplitude
    Node: Point of zero amplitude
    Between adjacent nodes all particles are in phase
    Particles on different sides of a node are in antiphase (180 degrees out of phase)
  • Progressive Waves transfer energy in the direction of travel
    Stationary waves - no energy is transferred, it is stored
    Progressive waves the amplitude is constant
    Stationary waves the amplitude varies across nodes- 0 amplitude
    and antinodes - maximum amplitude
  • Harmonics for closed at both ends:
    F0 = L = lander/2
    F1 = L = Lander
    F2 = L = 3*L/2
    F3 = L = 2 * Lander
  • Harmonics closed at one end:
    1st = L = 1 /4 * Lander
    2nd = L = 3/4 * Lander
    3rd = L = 5/4 * Lander