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The velocity of sound in air is determined by measurement of
sound travel times across known distances.
Determine the sound velocity in air for different distances
between sound source and microphone.
What you can learn about
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.
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 of the
sound wave and its ...
Sounds are generated by oscillations. The sound volume is
influenced by their relative amplitude, while the sound pitch
depends on their frequency. This relationship is examined based on
three examples: oscillating ruler, tuning fork, string of a
Try to ...
This experiment demonstrates, particularly clearly, the
propagation of sound waves in air and, thereby,
the working principle of the eardrum that is caused to oscillate by
The movement of the membrane is transferred to the neighbouring
molecules, which ...
The transmission (or conduction) of sound through a solid body
means: One end of the solid body is caused to oscillate (e.g. by
placing a tuning fork on it). This oscillation propagates through
the solid body to the other end of the solid body. The transmission
through the solid ...
The aim of this experiment is to enable the students to find out
that sound can also propagate in other media, e.g. liquids. For
this purpose, they study the propagation of the sound of a tuning
fork in a tube that can be filled with air or water. For
comparison, the sound ...
The aim of this experiment is to familiarise the students with
the "measure Acoustics" software. First, the students record the
sounds of two tuning forks with a microphone. Then, they analyse
the frequency spectrum and the course of the amplitude of the
recorded signal over ...
Oscillations can be transferred through a medium (e.g. air or
wood) in the form of sound waves. An oscillation with exactly one
oscillation frequency is called harmonic oscillation or pure
oscillation. In the amplitude-time-diagram, such an oscillation
corresponds to a sine ...
The human ear registers deep and high sounds as well as faint
and loud sounds. Are there limits or can we hear any kind of high
and deep sounds? In this experiment, the students learn that the
human ear can perceive sound only within a limited frequency range.
For this purpose, ...
The human sense of hearing is not only used to perceive sound,
it even enables us to localise the direction from which we hear
sound signals. On the horizontal plane of orientation (left/right,
front/back) as well as on the vertical plane of orientation
(top/bottom, front/back), ...
Sound waves are usually produced in locations where a medium,
e.g. air, is compressed and then allowed to expand again. Sounds
are caused by repetitive movements, called oscillations. The aim of
this experiment is to familiarise the students with the concepts of
In this experiment, the students visualise the oscillations of
tuning forks by plotting the oscillations of a pen-equipped tuning
fork on a sheet of paper. They see that the sine curve is the
course of an oscillation over time, and they compare the
frequencies and amplitudes of ...
If several sound signals reach our ears simultaneously, these
signals superpose, thus forming a resulting signal. If the
individual signals all have the same frequency, the resulting
signal can also be heard with this frequency. The volume, however,
varies. If one hears two sound ...
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