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Siemens Stiftung

The Ear, Hearing and Hearing Impairment;: Sound reflection - experiments

Experimentation instructions:
Experiment on sound reflection.

Without the metal plate, the ticking would be barely audible, but in the appropriate position, it can be heard very clearly: Sound waves are partly reflected when they hit an obstacle. The angle of incidence is just as big as the angle of reflection.

Information and ideas:
The experiment can be done in class together with the students.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves

Medientypen

Bild

Lernalter

11-18

Schlüsselwörter

Sound Wave (physics)

Sprachen

Englisch

Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

The Ear, Hearing and Hearing Impairment;: Sound propagation

Information sheet:
Scientific explanation of the phenomenon that it is possible to blow out a candle with sound.

The experiment "tambourine blows out candle" demonstrates clearly how sound waves propagate and that a movement of air particles is associated with it (you may use a bass drum instead of a tambourine). On the basis of this experiment the propagation of sound when speaking can be explained.

Information and ideas:
Simple experiment that can be reproduced easily in class.
The media used in this information sheet are available as individual media files on the media portal of the Siemens Stiftung.

Relevant for teaching:
Acoustic phenomena
Sound/acoustics: parameters
Vibrations and waves
Communication


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Guideline for the "Physics of sound - basic phenomena" media package

Guideline:
This document provides an overview of the central theme of the media package "Physics of sound - basic phenomena" with regard to content and teaching.

This guideline is aimed at teachers. All the media files in the package are presented. The guideline also provides teaching methods. Possible areas of use of the individual media are presented.


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Simulation

Siemens Stiftung

Sound propagation velocity in different materials

Simulation:
Sound velocity dependent on different materials.

The speed of sound is the speed at which sound waves propagate in a medium like air or water.
It is measured in m/s.

Information and ideas:
Various experiments on the speed of sound can be done with the students in Physics lessons.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Measuring of sound

Medientypen

Simulation

Lernalter

11-18

Schlüsselwörter

Sound Wave (physics)

Sprachen

Englisch

Dieses Material ist Teil einer Sammlung

Bild

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Sound absorption

Graphic:
If sound waves strike an obstacle with a corresponding material structure, they are absorbed, i.e. the entire mechanical energy of the sound is converted into thermal energy.

This effect is enhanced by sound barrier walls made of porous materials. By means of multireflection and dispersion, the passage of sound in such materials is extended considerably. The sound peters out.

Information and ideas:
Reference to students' everyday world: silence after snowfall.
Can be checked with the students in an experiment.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves

Anderer Ressourcentyp

Siemens Stiftung

Sound and types of sound

Content package for interactive whiteboards:
Individual media related to sound and types of sound are compiled here in a meaningful didactic way for teaching using an interactive whiteboard.


All media in the content package for the interactive whiteboards are included in this self-extracting file. The content package can be started simply by clicking the ".exe" file.

The interactive whiteboard consists of the following media:
· 1 interactive graphic on the fundamentals of sound, oscillations, and types of sound
· 2 interactive exercises on types of sound
· 5 photos of oscillograms of different types of sound
· 5 sample audio clips of different types of sound
· 5 photos of oscillograms of different types of sound
· 1 guideline with technical background information for teachers
· 1 link list
· 2 information sheets on the topic for students
· 1 worksheet on sound curves
· 1 experiment instruction on the topic of sound propagation and conduction

Information and ideas:
Most of the media in content package are also available as individual media on the media portal.

Medientypen

Anderer Ressourcentyp

Lernalter

11-18

Schlüsselwörter

Sound Wave (physics)

Sprachen

Englisch

Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Sound (link list)

Link list:
Many interesting links regarding the topic "Sound".

Information and ideas:
Suitable as a source for internet inquiry for the teacher and students.


Dieses Material ist Teil einer Sammlung

Bild

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Acoustic scattering

Graphic:
Acoustic scattering. One of several ways sound waves react when they hit an obstacle.

Scattering is a reflection of small structures in no particular preferred direction. It is very much dependent on frequency.

Information and ideas:
Can be checked with the students in an experiment.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves

Bild

Siemens Stiftung

Waves in the water

Photo:
If you want to give the students an initial impression of sound waves, the propagation of waves in water is very useful.

When a stone is thrown into the water, concentric circles spread out from the spot where the stone hit the water. Sound waves move away from the source of sound in a similar way.

Information and ideas:
The well-known photo may be a help for students to picture the propagation of sound waves in their minds. (Strictly speaking a water wave and a sound wave differ with respect to the direction of the vibration - transversal and longitudinal respectively!)

Relevant for teaching:
Acoustic phenomena
Vibrations and waves

Bild

Siemens Stiftung

Ultrasound materials testing - principle

Labeled graphic:
From the delay differences of the echoes recorded, layer thicknesses, errors and consistency can be calculated with oscilloscope graphs.

In engineering the checking of the quality of materials is an important task. A cheap way of testing materials where the material to be tested is not destroyed is based on the reflection of sound on interfaces.

Information and ideas:
These tasks are good for showing how behaviour of sound is used in practice.
Furthermore, internet research is good for explorative learning.

Relevant for teaching:
Sound/acoustics: parameters
Vibration and waves

Medientypen

Bild

Lernalter

11-18

Schlüsselwörter

Electroacoustics Sound Wave (physics)

Sprachen

Englisch