Physics

Surface tension with the ring method (Du Nouy method)

Principle

The force is measured on a ring shortly before a liquid film tears using a torsion meter. The surface tension is calculated from the diameter of the ring and the tear-off force.

Tasks

1. Determine the surface tension of olive oil as a func ...

Surface tension of liquids

Principle

The cohesive forces in a liquid generate tension on its surface, the so-called surface tension. A metal ring that is plunged into a liquid is withdrawn from the liquid. At a certain tensile force, the liquid film will be disrupted from the ring. Based ...

dummy

Barometric height formula

Principle

Glass or steel balls are accelerated by means of a vibrating plate, and thereby attain different velocities (temperature model). The particle density of the balls is measured as a function of the height and the vibrational frequency of the plate.

Tasks

Velocity of sound in metal rods

Principle

The velocity of sound in steel is determined by measurement of sound travel times across metal rods of known lengths.

Task

1. Determine the sound velocity by measuring the sound travel times in stainless steel f ...

Velocity of sound in air with Universal Counter

Principle

The velocity of sound in air is determined by measurement of sound travel times across known distances.

Task

1. Determine the sound velocity in air for different distances between sound source and microphone.

Acoustic Doppler effect with universal counter

Principle
If an emitter of sound or a detector is set into motion relative to the medium of propagation, the frequency of the waves that are emitted or detected is shifted due to the Doppler effect.

Task

1. Measure the Dopp ...

Acoustic Doppler effect with universal counterand Doppler emitter for TESS acustics

Chladni figures

Principle

Square and round metal plates are brought to vibrate through acoustic stimulations by a loudspeaker. When the driving frequency corresponds to a given eigen-frequency (natural vibration mode) of the plate, the nodal lines are made visible with sand. T ...

Chladni figures with the FG module and Cobra3

Principle

To show the two-dimensional standing waves on the surface of a square or circular plate.

Tasks

A frequency generator is connected to a sound head. The sound head drives a Chaldni plate. White sand is sprinkled randomly to cover t ...

Velocity of sound using Kundt's tube anddigital function generator

Principle

Cork dust in a glass tube is set into tiniest motion by a sound wave. If the frequency of the sound wave matches the natural frequency of the volume in the glass tube, a standing wave will form. The corc dust then assembles in visible patterns that sh ...

Velocity of sound using Kundt's tube with Cobra3

Principle

A metal rod is made to vibrate longitudinally by rubbing it with a cloth. The gas column in a glass tube is caused to vibrate naturally as a result of resonance, through the radiation of sound from a disc attached to the end of the rod. The ratio of the velocities o ...

Wavelengths and frequencies with a Quincke tube with a multimeter

Principle

When a sound wave of a particular frequency is divided into two coherent components (like, for example, light waves in an interferometer experiment), and if the path of one of the component waves is altered, it is possible to calculate the wavelength ...

Wavelengths and frequencies with a Quincke tube with the FG module and Cobra3

Principle

A sound wave of a particular frequency is divided into two coherent components (like, for example, light waves in an interferometer experiment), and if the path of one of the component waves is altered, it is possible to calculate the wavelength of the sound wave an ...

Resonance frequencies of Helmholtz resonators with Cobra3

Principle

Acoustic cavity resonators posses a characteristic frequency which is determined by their geometrical form. In this case the resonator is excited to vibrations in its resonance frequency by background noise.

Tasks

Determination of diffe ...