waves

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Poisson Spot

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  • Shine coherent light onto a spherical object and a dim spot of light appears in the center of the object’s circular shadow. This spot is called a Poisson spot, or Arago spot, and can be explained using the wave interpretation of light.
  • Green or red lasers, diverting lens, optics track and components located in L35, section A. BB in glass slides located in L01, section B6.
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Doppler Rocket

 

Doppler Rocket Demo Picture

Two people required to use this demo. Each person holds set of handles, and unwinds rope (about 20 m) . When one set of handles is quickly separated (handles initially held together, then quickly pulled apart) the football shaped “rocket” is forced to slide down the ropes. The rocket contains a noise maker (turned on manually) that exhibits Doppler shift when in motion. Users take turns launching and catching the rocket. Doppler affect can be heard by audience members in close proximity.

See: https://www.pasco.com/prodCatalog/WA/WA-9826_doppler-rocket/

  • Located in L02, section C2

 

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Ripple Tank

 

Ripple Tank Demo Picture
Ripple Tank Demo Picture 2

  • Study wave phenomena such as reflection, refraction, diffraction,
    and interference.
  • Strobe attachment allows demonstrator to “slow down”
    waves. Projection mirror and screen can be used for classroom visibility.
  • Ripple tank and accessories located in L02, section C2.

 

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Partial Transmission

 

Partial Transmission Demo Picture

  • Waves propagate down Shive wave apparatus at a rate that depends on rod length. Connect two different Shive wave apparatuses together- one with short rods, the other long. Due to a difference in wave propagation speed partial reflection and transmission occurs at their interface.
  • Use small binder clips to attach apparatuses together.
  • Located in L02, section B2.

 

 

 

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Pendulum Wave

 

Pendulum Wave Demo Picture

  • Aesthetic demonstration based on relationship between period and arm length.
  • Use wooden slat to start pendula in unison with equivalent
    amplitudes. As pendula cycle through all possible phase relationships, a variety
    of wave patterns emerge.
  • Located in L02, section C-1.
  • see: https://www.youtube.com/watch?v=yVkdfJ9PkRQ