Item no.: P2510700 Principle The spectral lines of hydrogen and mercury are examined by means of a diffraction grating. The known spectral lines of Hg are used to determine the grating constant. The wave lengths of the visible lines of the Balmer series of H are measured. Tasks Determination of the diffraction grating constant by
Item no.: P2511200 Principle With electron spin resonance (ESR) spectroscopy compounds having unpaired electrons can be studied. The physical background of ESR is similar to that of nuclear magnetic resonance (NMR), but with this technique electron spins are excited instead of spins of atomic nuclei. The g-factor of a DPPH (Diphenylpikrylhydrazyl) specimen and the halfwidth of
Item no.: P2510311 Principle Electrons are accelerated in a tube filled with mercury vapour. The excitation energy of mercury is determined from the distance between the equidistant minima of the electron current in a variable opposing electric field. Tasks To record the countercurrent strength Ι in a Franck-Hertz tube as a function of the anode voltage U. To
Item no.: P2510200 Principle Electrons are accelerated in an electric field and enter a magnetic field at right angles to the direction of motion. The specific charge of the electron is determined from the accelerating voltage, the magnetic field strength and the radius of the electron orbit. Tasks Determination of the specific charge of the
Item no.: P2250105 Principle Monochromatic light impinges on amica plate, perpenicularly to its optical axis. If the thickness of the plate is adequate (lambda/4 plate), a phase shift of 90° occurs between the ordinary and the extraordinary beam when the latter leaves the crystal. The polarisation of exiting light is examined for different angles between
Item no.: P2220705 Principle Light is caused to interfere by means of a beam splitter and two mirrors according to Michelson’s set up. Substituting the air in a measurement cuvette located in one of the interferometer arms by CO2 gas allows to determine the index of refraction of CO2. Tasks A Michelson Interferometer is set up
Item no.: P2430760 Principle A magnetic field is generated in a ring-shaped iron core by a continuous adjustable direct current applied to two coils. The field strength Η and the flux density B are measured and the hysteresis recorded. The remanence and the coercive field strength of two different iron cores can be compared. Tasks Record the hysteresis curve
Item no.: P2450201 Principle The Q factor of oscillating circuits is determined from the band width and by the Pauli method. In inductively coupled circuits (band-pass filters) the coupling factor is determined as a function of the coil spacing. Tasks Determine the dissipation factor t and k and the quality factor Q from the band
Item no.: P2440611 Principle The current and voltage of parallel and series-tuned circuits are investigated as a function of frequency. Q-factor and band-width are determined. Tasks Determination of the frequency performance of a Series-tuned circuit for voltage resonance without damping resistor, current resonance without damping resistor, current resonance with damping resistor. parallel-tuned circuit for current
Item no.: P2440260 Principle A magnetic field of variable frequency and varying strength is produced in a long coil. The voltages induced across thin coils which are pushed into the long coil are determined as a function of frequency, number of turns, diameter and field strength. Tasks Determination of the induction voltage as a function