CN103544871B - Acoustic control and airborne sound experimental provision - Google Patents
Acoustic control and airborne sound experimental provision Download PDFInfo
- Publication number
- CN103544871B CN103544871B CN201310555450.2A CN201310555450A CN103544871B CN 103544871 B CN103544871 B CN 103544871B CN 201310555450 A CN201310555450 A CN 201310555450A CN 103544871 B CN103544871 B CN 103544871B
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- tank
- acoustic control
- air
- control tester
- sound
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
A kind of air of demonstrating can conduct sound and vacuum can not conduct acoustic control and the airborne sound experimental provision of sound, it is characterized in that: the glass jar of a with closure, gland bonnet is arranged there is manually opened and air valve that is closing function, a band voicing sensor is placed in tank, light emitting diode, the acoustic control tester of loudspeaker and power pack, experiment adopts <b> to trigger acoustic control tester </b> in <b> tank in the outer </b> mode of clapping one's hands of tank and sends song and flash.The present invention changes the atomic little loudness change being difficult to differentiate that traditional experiment device dependence people ear spreads out of to offer an explanation sounding body in tank, but adopts and has the acoustic control tester of certain threshold value to judge by soniferous ability in the export-oriented tank of tank.Realize not needing, under high-grade vacuum equipment condition, but effectively to complete this basic experiment needed for physics teaching in secondary school.
Description
Technical field
The present invention relates to physics teaching in secondary school experimental provision used, specifically refer to that demonstration air can conduct a kind of acoustic control and the airborne sound experimental provision that sound and vacuum can not conduct sound.
Background technology
With the infrastest that laboratory facilities demonstration " vacuum can not conduct sound; air can conduct sound " are initiation formulas in physics teaching in secondary school, the success of experiment forms correct understanding by contributing to the many aspects such as to contact of student to the utilization of experimental design, laboratory facilities, experimental technique and relevant knowledge.
But, owing to being limited by the limitation of common laboratory air-extractor function, vacuum tightness that traditional experiment device can reach apart from " ideal vacuum " difference very far, so experimental result is always " effect is far from accordance with expectation ", very undesirable, have to wind up a matter hastily.Moreover, traditional experiment device produces casual misleading to student experimentation is also easy: by the source of sound (as electric bell) of a normal sounding, put into heavy sheet glass bell jar, its sound immediately diminishes, then only judge " the tinkle of bells is constantly drawn out of due to air and then becomes less " by people's ear, this is (this is caused by people's ear physiological structure) unable to do what one wishes obviously.So teacher have to rely on inadequate inference mode to conclude: " if air is fully drawn out, define real vacuum, that electric bell sound we just necessarily do not heard! "
The experimental result of such syllogism does not obviously meet the original intention that experimental design person wishes to reach originally.
Summary of the invention
The object of the invention is a set of terse and effective device of design, under the condition still using common laboratory air-extractor, carry out alternative that and overlap traditional airborne sound experimental provision.
The technical solution used in the present invention is as follows: the glass jar of a with closure, gland bonnet is arranged there is manually opened and air valve that is closing function, place the acoustic control tester of band voicing sensor, light emitting diode, loudspeaker and a power pack in tank, experimental provision adopts
outside tankthe mode of clapping one's hands triggers
acoustic control tester in tanksend song and flash, first acoustic control tester being put into tank, clap one's hands outside tank, in tank, acoustic control tester is triggered and have issued the flash of light that experimenter can see and the song that can hear.Then cover is screwed, with any one air-extractor in laboratory, air extraction in tank is gone, then gas check valve is closed after most of air is drawn out of, at this moment clap one's hands outside tank---in tank, acoustic control tester just can not be triggered, again air valve is opened, then claps one's hands---acoustic control tester is just triggered easily.This illustrates that air valve one is opened, and air enters into tank from valve port while rapidly, and the sound wave of clapping one's hands also just can enter into tank with air by valve port while conduction.
Experimentation demonstrates air can become the medium of Acoustic Wave Propagation and vacuum can not become the medium of Acoustic Wave Propagation.
Explanation about novelty of the present invention: the present invention has carried out the design of reverse thinking to this traditional mode of testing---no longer rely on the atomic little loudness change being difficult to differentiate that people's ear spreads out of to offer an explanation sounding body in tank, but adopt and have the acoustic control tester of certain threshold value to judge by soniferous ability in the export-oriented tank of tank.Wherein these parts of acoustic control tester are ripe devices, are made up of, already by persons skilled in the art are familiar with sonic transducer, light emitting diode, loudspeaker, power pack etc.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural representation.
Each several part title in figure: 1-air valve; 2-gland bonnet; 3-glass jar; 4-acoustic control tester; 5-sonic transducer; 6-light emitting diode; 7-loudspeaker; 8-power pack.
Embodiment
In the embodiment shown in fig. 1, the glass jar (3) of a with closure (2), covering the air valve (1) arranging and have and open and close function, place the acoustic control tester (4) of band voicing sensor (5), light emitting diode (6), loudspeaker (7) and power pack (8) in tank, described experimental provision experimental provision adopts
outside tankthe mode of clapping one's hands triggers
acoustic control tester in tanksend song and flash.First acoustic control tester (4) is put into tank, clap one's hands outside tank, in tank, acoustic control tester is triggered and have issued the flash of light that experimenter can see and the song that can hear.Then cover is screwed, air extraction in tank is gone by the air valve opened with any one air-extractor of laboratory, then gas check valve is closed after most of air is drawn out of, at this moment clap one's hands outside tank---in tank, acoustic control tester can not be triggered then, again air valve is opened, then claps one's hands---acoustic control tester is then just triggered easily.Illustrate that air valve one is opened, air enters into tank from valve port while rapidly, and the sound wave of clapping one's hands also enters tank from valve port while conduction with air.Experimentation demonstrates a kind of medium that air is Acoustic Wave Propagation and vacuum can not become the medium of Acoustic Wave Propagation, can not be transaudient.
Claims (1)
1. demonstrate air and can conduct a kind of acoustic control and the airborne sound experimental provision that sound and vacuum can not conduct sound, it is characterized in that: the glass jar of a with closure, gland bonnet is arranged there is manually opened and air valve that is closing function, the acoustic control tester of band voicing sensor, light emitting diode, loudspeaker and a power pack is placed, acoustic control tester in tank
adopt outside tankthe mode of clapping one's hands triggers
acoustic control tester in tanksend song and flash, first acoustic control tester is put into tank, clap one's hands outside tank, in tank, acoustic control tester is triggered and have issued the flash of light that experimenter can see and the song that can hear, is then screwed by cover, air extraction in tank is gone with any one air-extractor in laboratory, then gas check valve is closed after most of air is drawn out of, at this moment clap one's hands outside tank---in tank, acoustic control tester just can not be triggered, then is opened by air valve, then claps one's hands---and acoustic control tester is just triggered easily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555450.2A CN103544871B (en) | 2013-11-10 | 2013-11-10 | Acoustic control and airborne sound experimental provision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555450.2A CN103544871B (en) | 2013-11-10 | 2013-11-10 | Acoustic control and airborne sound experimental provision |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103544871A CN103544871A (en) | 2014-01-29 |
| CN103544871B true CN103544871B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310555450.2A Expired - Fee Related CN103544871B (en) | 2013-11-10 | 2013-11-10 | Acoustic control and airborne sound experimental provision |
Country Status (1)
| Country | Link |
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| CN (1) | CN103544871B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035799Y (en) * | 2007-03-13 | 2008-03-12 | 沈新科 | Device of demonstrating experiment of the inability of transmitting sound in vacuum |
| CN101714305A (en) * | 2008-10-07 | 2010-05-26 | 许航 | Sound performance demonstration device |
| CN202332015U (en) * | 2011-11-10 | 2012-07-11 | 田雨 | Experimental device for sound transmission incapability in vacuum |
| CN202917067U (en) * | 2012-06-09 | 2013-05-01 | 黄声会 | Sound propagation demonstration instrument |
| CN203552543U (en) * | 2013-11-10 | 2014-04-16 | 沈昌生 | Sound control and airborne sound experiment device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054676B2 (en) * | 1983-07-15 | 1985-11-30 | 実 大塚 | vacuum bell device |
-
2013
- 2013-11-10 CN CN201310555450.2A patent/CN103544871B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035799Y (en) * | 2007-03-13 | 2008-03-12 | 沈新科 | Device of demonstrating experiment of the inability of transmitting sound in vacuum |
| CN101714305A (en) * | 2008-10-07 | 2010-05-26 | 许航 | Sound performance demonstration device |
| CN202332015U (en) * | 2011-11-10 | 2012-07-11 | 田雨 | Experimental device for sound transmission incapability in vacuum |
| CN202917067U (en) * | 2012-06-09 | 2013-05-01 | 黄声会 | Sound propagation demonstration instrument |
| CN203552543U (en) * | 2013-11-10 | 2014-04-16 | 沈昌生 | Sound control and airborne sound experiment device |
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| Publication number | Publication date |
|---|---|
| CN103544871A (en) | 2014-01-29 |
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Granted publication date: 20160120 Termination date: 20161110 |