Physics Educational Materials

Supplier: ELWE LEHRGERAETEBAU KLINGENTHA

The exercise oscilloscope is placed at the Helmholtz coils so that its main axis coincides with the axis of the coils. A sawtooth-shaped voltage is applied to the deflection plates of the oscilloscope so that a smooth horizontal line appears on the screen. Let direct current pass through the coils at a preset anode voltage and adjust the intensity of the current so that the line is focused at one point. The specific charge e/m of the electron can be calculated from the measured values ​​of the anode voltage and the current through the coil.

Supplier: ELWE LEHRGERAETEBAU KLINGENTHA

Cone-shaped pressure chamber speaker with high power resistance. Used for general acoustic tests, eg together with resonator 765-0080. Connects to a tone generator with amplifier. Melt protection prevents damage during overload. Technical data.

Supplier: ELWE LEHRGERAETEBAU KLINGENTHA

Franck-Hertz's experiment is one of the best ways to show the quantum properties of atoms. The experiment verifies the excitation energy of the Hg atoms through collisions with free electrons. Franck-Hertz tubes consist of an oxide cathode, gallery anode and a collection electrode. The evacuated tube contains a drop of Hg. Before starting the measurements, the pipe must be heated to 200 °C, partly to increase the pressure of the Hg steam and partly to obtain a sufficient probability of collision. When the temperature in the tube has become constant, the cathode is heated and a direct voltage which can be varied in the range 0 to 50 V is connected between the cathode and the anode. When the counter voltage is set to about -1,5 V and the anode voltage increases slowly from 0 V, the electrons will soon reach speeds in the acceleration range of the tube so that an increasing part of the primary current reaches the collector electrode. As the velocity of the electron flux approaches the lowest excitation level of the Hg atoms (4,9 eV), the electrons of the Hg atoms are capable of leaving the atoms and thus losing some of their velocity. The collector current drops to a minimum value. The Hg atom then emits its 253,7 nm ultraviolet line and then returns to its normal energy level. As the acceleration voltage increases further, the current reaching the collector electrode will increase again. This process is repeated periodically many times.

Supplier: OSRAM

Equipment for demonstrating photoelectric power and determining Planck's constant. A photocell is equipped with filters that only transmit light of a certain wavelength. The photocell is illuminated with light from a Hg lamp. The potassium cathode then emits electrons that pass over to the unlit anode. Over time, a voltage arises that prevents new electrons from reaching the anode. The resulting voltage is measured with a measuring amplifier and a voltmeter. The measurement is repeated with filters for different wavelengths. Photocell and Hg lamp are equipped with magnets at the bottom for stable installation on the mounting plate. List of equipment:

Supplier: KVANT LIFE SCIENCE

Equipment for laser sound transmission experiments. The included microphone, tape recorder or function generator is used as the sound source. The rate consists of.

Supplier: KVANT LIFE SCIENCE

The advantages of a diode laser compared to a HeNe laser are mainly small format, low power consumption and long service life, as well as the possibility of electronic modulation. The laser is modular in the range 100 Hz 20 MHz. Dimensions.

Supplier: KVANT LIFE SCIENCE

New optical models for laser optics (15 parts). Consists of.

Supplier: ELWE LEHRGERAETEBAU KLINGENTHA

Motor with rotor that lacks iron and thereby has a very low moment of inertia, which in turn enables fast start and stop or change of direction of rotation. The time from start to maximum speed (3000 rpm) is only 11 ms. Can be used for experiments with mechanical oscillations. The motor is most conveniently operated with a function generator.

Supplier: 3B Scientific

Digital counter/timer for measuring duration of motion, transition times, periods, pendulum periods, frequencies, as well as for counting events or Geiger tube pulses. Includes a speaker that can be turned on and off and power supplies for direct connection to photo gate or a Geiger-Müller counter.

Supplier: 3B Scientific

Highly evacuated electron tube with focusing electron gun and fluorescent screen (90×60 mm) inclined relative to the beam axis, so that the path of the beam can be seen and the effects of electric and magnetic fields can be studied. The electron beam can be deflected electrically in the electric field of the built-in plate capacitor, and magnetically by using an optional Helmholtz coil pair D. By adjusting the electric field so that it cancels the magnetic deflection, it is possible to determine the specific charge e/m and the velocity of the electrons.

Supplier: CORNELSEN EXPERIMENTA

Circular gutter made of aluminum sheet with insulating handle. Fits U-core 765-1077 and was used, among other things, when demonstrating the principle of induction furnaces.

Supplier: CORNELSEN EXPERIMENTA

Educational Materials, Waves and Oscillations, Application: Physics, Strings for monochord

Supplier: CORNELSEN EXPERIMENTA

With the equipment, centrifugal forces that arise during a body's rotation around a specific axis can be measured and examined. The device consists of a plane with a path for a cart. On the underside there is a vertical shaft that is mounted in a bearing. The plane is made to rotate with a laboratory motor connected with a drive belt to the bearing. The experimental trolley is placed on the track and prevented from leaving the track by two bent steel wires. A wire is connected to the trolley that runs over a pulley and on to a dynamometer.

Supplier: CORNELSEN EXPERIMENTA

Educational Materials, Waves and Oscillations, Application: Physics, Monochord

Supplier: CORNELSEN EXPERIMENTA

Light plastic pendulum ball. Suitable for experiments with pressure waves with tambourine.

Supplier: 3B Scientific

Track with two trolleys and other accessories for investigating linear motion. The trolleys move with minimum friction on wheels with high-quality ball-bearings. They are fitted with magnets at their front ends for experiments involving both elastic and inelastic collisions.