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14.2 Waves cont.

14.2 Waves cont. Getting crazier and crazier!. Stayin’ up or flippin’ down?. When a wave bounces off a fixed end that does not move, the wave will invert. If the wave reflects off a free end, the wave will stay upright. Superposition to the rescue!.

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14.2 Waves cont.

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  1. 14.2 Waves cont. Getting crazier and crazier!

  2. Stayin’ up or flippin’ down? When a wave bounces off a fixed end that does not move, the wave will invert. If the wave reflects off a free end, the wave will stay upright.

  3. Superposition to the rescue! Waves don’t just do their own thing, they are constantly interfering with one another. This is known as interference and can be either constructive, when the displacement is in the same direction, or destructive when the displacement is in opposite directions.

  4. Ode to the node When to waves sync up and created a standing wave, there are positions of maximum and minimum displacement. A point of zero displacement is called a node and a point of maximum displacement is known as an antinode. http://www.physics.ohio-state.edu/~ntg/reu/pulses.html

  5. I’m bouncin’ off the walls again… Waves are constantly bouncing off of surfaces. The wave going to the surface is called the incident wave. The wave coming off the surface is the reflected wave.

  6. normal ΘiΘr reflected incident Angle’s alike The Law of Reflection states that the angle of incident, θi,will equal the reflected angle, θr.

  7. Bending in the breeze The speed at which a wave travels depends on the medium it travels in. As a wave passes between two boundaries, its wavelength changes which causes it to change direction. This effect is known as refraction. To maintain the same frequency, the wave must change speed as it changes medium.

  8. Diffraction Action! As a wave passes the edge of a boundary it bends around the edges. This bending is known as diffraction and can create some interesting effects. The fuzziness of shadows is a direct cause of this effect. When two waves diffract near each other, they interfere with one another.

  9. Single or a double? Single Slit Double Slit Dark areas represent destructive interference, (wave amplitude decreases), and bright areas represent constructive interference (wave amplitude increases)

  10. “It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if your described a Beethoven symphony as a variation of a wave pressure.” - Albert Einstein HW – Pg 345 # 20, 22, 23, 45, 47

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