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02:31 IWF (Göttingen) German 2004

Leiterschaukel im Magnetfeld

The behaviour of a wire loop under current flow in the homogeneous field of a horseshoe magnet is examined. First the experimental setup is introduced, then the voltage is increased step by step and the deviation of the loop is observed.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:35 IWF (Göttingen) German 2004

Turbulente Strömung

The behaviour of water flowing around a circular profile is examined. The shape of the streamlines is shown, especially the fact that they tear off behind the body and unstable vortexing occurs is examined in slow-motion. One can see that the flow velocity changes in space and time.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:37 IWF (Göttingen) German 2004

Laminare Strömung

The behaviour of water flowing around a streamline profile is examined. The shape of the streamlines is shown and namely the fact that they approximately show a time constant streamline density and velocity at each place. With slow-motion.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:59 IWF (Göttingen) German 2004

Schmelzen von Metall

The temperature profile of a piece of metal is examined during continous energy input. A piece of Wood's metal is heated on a hot plate. A digital thermometer shows the temperature while the melting process is filmed. A corresponding temperature-time diagram is recorded for later evaluation. The energy input, the specific melting temperature, and the entropy difference are calculated and compared with other values.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:41 IWF (Göttingen) German 2004

Kontinuitätsgleichung

The flow behaviour of water in pipe constriction is demonstrated. The flow is examined by means of the shape of the streamlines. From mass continuity equations can be derived that compare the velocity quotient with the flown area. This is exemplarily shown and calculated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:03 IWF (Göttingen) German 2004

Tripelpunkt

The coincidence of the solid, liquid and gaseous aggregate state of water is demonstrated. A bowl of water is placed in the bell jar. At a pressure of 6,1 millibar and a temperature of 0,01°C the water freezes, at the same time it starts to bubble here and there - it is boiling! With slow-motion.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:27 IWF (Göttingen) German 2004

Dielektrikum im Kondensator

The behaviour of a dielectric fluid between two metal sheets is shown when voltage is applied. The experimental set-up is explained with a diagram, then voltage application is varied in the experiment, resulting in the rising and falling of the fluid. The adhesive forces are also discussed.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:56 IWF (Göttingen) German 2007

Navier-Stokes Gleichung

To determine the velocity field of a current the so-called "particle image velocimetry" is a suitable method. With the help of the distance of individual particles and the time interval the velocity field of a current is determined. The procedure is applied at a real current, the results are noted. One can compare the most important observations with the theoretical description by the Navier-Stokes equation.
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: German
06:21 IWF (Göttingen) German 2007

Coriolis- und Zentrifugalkraft im rotierenden Bezugssystem

The trajectory of a ball on a rotating disk is examined both from the point of view of an outside person and from the point of view of a rotating observer. One observes the curvature of the trajectory in the rotating system and introduces additional forces, in order to be able to explain the movement of the ball in the rotating system with the help of the Newton's second axiom.
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: German
04:20 IWF (Göttingen) German 2007

Karmansche Wirbelstraße

The behaviour of currents flowing around obstacles is examined. The vortices behind the object are not stationary, but are taken away by the current caused by its internal friction. At their point of origin only new vortices develop which detach from the object and start to migrate. All in all a vortex street occurs behind an obstacle in such a flow. Kármán's stability criterion is described and compared with experimental results.
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: German
04:07 IWF (Göttingen) German 2007

Rayleigh-Kriterium: Das Auflösungsvermögen optischer Instrumente

The maximum resolution of an optical instrument is described by the Rayleigh criterion. We observe two spots of light through a telescope to investigate this criterion. When the resolution-limit is reached by decreasing the size of the aperture, we expect the light spots to blur. This is first examined qualitatively and then compared quantitatively with the Rayleigh criterion.
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: German
06:10 IWF (Göttingen) German 2007

Absorption und Streuung

In this movie the two main causes for the decrease of light intensity while passing through materials are examined. Based on qualitative observations quantitative measurements are performed and evaluated systematically. Thus the exponential decrease of light intensity in absorption is shown to be a function of the distance passed, which is described by Beer-Lambert law of absorption. While examining the scattering of light the dependence on the frequency of light is shown and the proportionality to the fourth power explained.
  • Published: 2007
  • Publisher: IWF (Göttingen)
  • Language: German
05:09 IWF (Göttingen) German 2004

Umströmung verschiedener Hindernisse im Strömungskanal

The flow of water is visualized with tiny particles. The flow types laminar and turbulent are introduced and examined using different profiles. Rectangular, square, fully or partly cylindrical, streamlined and aerofoil shaped bodies are put in the flow channel. Finally the flow in a pipe constriction is examined.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:35 IWF (Göttingen) German 2004

Tief- und Hochpass

The relationship between input and output voltage is examined. The circuits of low-pass and high-pass filter are demonstrated at the beginning of the tests. Then an alternating voltage of increasing frequency is applied. The oscilloscope shows the amplitudes of input and output voltage and the phase shift. Parallel to this experiment the amplitude-frequency diagram is recorded.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:04 IWF (Göttingen) German 2004

Fadenpendel

The dependence of vibration time of the string pendulum from different factors is examined and finally demonstrated in phase space. After introducing the experimental setup several test series are carried out. The first one examines the impact of the pendulum length on the vibration period, showing three different lengths. The dependency from the pendulum mass is examined with two bodies of different density. In the third part different deviations and their effect on the vibration period are demonstrated. Finally, the phase space and its timely development is shown with a real pendulum.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:52 IWF (Göttingen) German 2004

Bestimmung von Cp/Cv nach Rüchardt

The ratio cp/cv is determined by means of a small object swinging on a gas column. After introducing the experimental setup air and argon are measured three times each. There is no interpretation but all relevant data are given in order to calculate the adiabatic index of both gases.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
05:40 IWF (Göttingen) German 2004

Erzeugung und Überlagerung kohärenter Wellen zu Interferenzstrukturen

Various wave types and experimental setups are used to illustrate the phenomenon. The interfering of waves generated by phase-locked transmitters is illustrated with water waves and then with waters waves. The interference of waves which were split by a beam divider is demonstrated with microwaves. Here the maxima and minima can be located well. A Michelson interferometer is used for the demonstration of light waves.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:11 IWF (Göttingen) German 2004

Druckverhältnisse einer strömenden realen Flüssigkeit

The pressure patterns of streaming water in different pipe configurations are examined. Several vertical manometers which indicate the static pressure are fixed at the horizontal flow pipe. In a first experiment the dependency of the pressure from the increasing friction due to flow velocity are demonstrated in a cylindrical pipe. At a slow efflux velocity the water shows a nearly ideal behaviour, at high velocities the impact of friction is can be seen clearly. In other experiments the effects of pipe constrictions are examined.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:31 IWF (Göttingen) German 2004

Doppelbrechung und Polarisation von Licht

The experiment
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:38 IWF (Göttingen) German 2004

Ionenwanderung

The migration of potassium permanganate ions to the positive electrode is demonstrated. By means of chronometry and all further data the second part of the film shows the evaluation including the drift velocity and the calculation of the avarage ion mobility compared with the published value.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
05:35 IWF (Göttingen) German 2004

Farbfadenversuch nach Reynolds - Übergang von laminarer zu turbulenter Strömung

The video of the Reynolds transition experiment, developed for physics teaching, shows the continuous transition from laminar to turbulent flow. Additionally, the critical Reynolds number of the experimental setup is determined approximately. Using this video the student can measure all necessary data and then calculate his result.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:50 IWF (Göttingen) German 2004

Absorptions- und Emissionsspektrum von Natrium

The atomic spectra of absorption and emission in Sodium are examined. In the first part the light of a halogen bulb is directed through a cell with sodium vapour and then spatially divided by means of the grating spectrograph. During evaporation in the cell both D lines of sodium are absorbed more and more clearly from the continuous spectrum of the lamp. In the second part the achieved spectrum is compared with a sodium vapour lamp. One can see that to each resonance absorption line belongs an emission line of the same wavelength and vice versa. It thus follows that each wavelength which is absorbed can also occur in emission if enough energy was applied to the atom.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:00 IWF (Göttingen) German 2004

Wellenlängenbestimmung im Natrium-Spektrum

The atomic spectrum of sodium is examined in an experimental setup. The light of a sodium vapour lamp is spatially separated by a grating spectrograph. Using a semipermeable mirror it is possible to interfere the obtained spectrum with that of a mercury vapour lamp. Thus the spectral lines can be easily compared. By means of the approximately linear spatial division the spectral lines of sodium are determined with the known lines of mercury.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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