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02:31 IWF (Göttingen) German 2004

Auflösungsvermögen

It is shown that in an optical image the individual light spots are diffraction patterns caused by the opening of the imaging lens. The resulting limit of the angular resolution is demonstrated with the aid of two pairs of holes with different separations.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
00:55 IWF (Göttingen) German 2003

Plastische Verformung und Zerreißfestigkeit

The measurements performed in the experiment "Elastic deformation, Hooke's law" (C 14833) on a copper wire, which had been limited to elastic deformations at small stresses, will be extended here to larger stresses. When the yield stress is exceeded, plastic, i.e. irreversible deformation is observed. A further increase of the stress beyond the rupture strength, leads to rupture. A 40 cm long piece of wire is suspended on a lab stand, and carries a tray on which weights can be deposited. A pillow under the tray will dampen the fall when the wire ruptures. The loading of the tray occurs in three steps : First, 2 kg cause a clearly visible elongation. The addition of 1 kg results in a slow length change of several centimeters, the wire "flows", until "work hardening" leads to a constant elongation. The addition of only 200 g finally leads to rupture, as the rupture strength is exceeded.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
02:38 IWF (Göttingen) German 2003

Foucaultscher Pendelversuch

A relatively simple demonstration and quantitative determination of the rotation of the earth using a simple pendulum several meters long, the so-called Foucault pendulum. The frequency of rotation can be measured in less than one minute. After carefully damping any spurious vibrations of the pendulum held at its maximum excursion, it is released using a mechanism that avoids shaking it. On the projection screen one can see how the maximum excursion of the pendulum wire shifts from one period to the next. A quantitative evaluation leads to the well known rotational frequency of the earth (1/day). Note that for this evaluation the geographic latitude has to be considered at which the experiment is being performed (f = 51.5 degrees). The actual rotational frequency of the observed rosette trace is here smaller than on the pole. On the equator, it would vanish.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
02:41 IWF (Göttingen) German 2004

Ausweichströmungen

Fluid flow around several objects and the effect of viscosity are shown in a two-dimensional apparatus. Aluminum tinsel has been added to the fluid to indicate locally the instantaneous direction and magnitude of the velocity of the fluid.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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