CN103544871A

CN103544871A - Sound control and airborne sound experiment device

Info

Publication number: CN103544871A
Application number: CN201310555450.2A
Authority: CN
Inventors: 沈昌生
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-10
Filing date: 2013-11-10
Publication date: 2014-01-29
Anticipated expiration: 2033-11-10
Also published as: CN103544871B

Abstract

Disclosed is a sound control and airborne sound experiment device for demonstrating that air can transmit sound and vacuum can not transmit the sound. The sound control and airborne sound experiment device is characterized in that a glass pot with a sealing cover is arranged, an air valve with the manual opening function and the manual closing function is arranged on the sealing cover, a sound control experiment device provided with a sound transducer, a light-emitting diode, a loudspeaker and a power source box is placed into the pot, and the sound control experiment device can be triggered in a clapping mode to give out a singing sound and give a flare. According to the sound control and airborne sound experiment device, the mode that according to a traditional experiment device, quite minute loudness changes which are hard to distinguish and are transmitted by a sounding body in the pot are distinguished by depending on the human ears is changed, the sound control experiment device with a certain threshold value is adopted to judge the capacity of transmitting the sound from the exterior of the pot to the interior of the pot, and the basic experiment required by middle school physics teaching can be effectively completed under the condition that high-grade vacuum equipment is not required.

Description

Acoustic control and airborne sound experimental provision

Technical field

The present invention relates to physics teaching in secondary school experimental provision used, specifically refer to that demonstration air can conduct sound and vacuum can not be conducted a kind of acoustic control and the airborne sound experimental provision of sound.

Background technology

With laboratory facilities demonstrations " vacuum can not be conducted sound; air can conduct sound ", be the infrastest of an initiation formula in physics teaching in secondary school, the success of experiment will contribute to student to form correct understanding to many aspects such as contacting of 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 is very far away apart from " ideal vacuum " difference, so experimental result always " effect is far from accordance with expectation " is very undesirable, have to wind up a matter hastily.Moreover, traditional experiment device also easily produces casual misleading to student at experimentation: by the source of sound of a normal sounding (as electric bell), put into heavy sheet glass bell jar, its sound immediately diminishes, then only depend on people's ear to judge " the tinkle of bells is because air is constantly drawn out of and then becomes less ", this is (this be due to people's ear physiological structure due to) unable to do what one wishes obviously.So teacher have to rely on inadequate inference mode to conclude: " if air is extracted out completely, formed real vacuum, that electric bell sound has not necessarily been heard! "

The experimental result of such syllogism does not obviously meet experimental design person and originally wishes the original intention reaching.

Summary of the invention

The object of the invention is to design a set of terse and effectively device, still using under the condition of common laboratory air-extractor, substitute 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, on gland bonnet, arrange and there is manually opened and air valve closing function, in tank, place an acoustic control tester with sonic transducer, light emitting diode, loudspeaker and power pack, acoustic control tester can trigger and sends song and flash by the mode of clapping one's hands.

Experimental procedure is as follows: first acoustic control tester is put into tank, at tank, clap one's hands outward, in tank, acoustic control tester is triggered and has sent the experimenter flash of light that can see and the song that can hear.Then cover being screwed, with any one air-extractor of laboratory, air in tank is extracted out and gone, after most of air is drawn out of, then close gas check valve, at this moment at tank, clap one's hands outward---in tank, acoustic control tester just can not be triggered.Finally air valve is opened, then is clapped one's hands---acoustic control tester is just triggered easily.This explanation 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 enters into tank with air by valve port while conduction.Proved that air is 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 the traditional mode of this experiment---no longer rely on the atomic little loudness variation that people's ear is offered an explanation the indistinguishable that in tank, sounding body spreads out of, 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 acoustic control tester itself is ripe device, by persons skilled in the art are familiar with.

The present invention's a kind of innovative experiment design of can yet be regarded as, at the basic experiment that does not need effectively to complete under high-grade vacuum equipment condition a Middle School Physics.

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), the air valve (1) with opening and closing function is set covering, in tank, place the acoustic control tester with sonic transducer (5), light emitting diode (6), loudspeaker (7) and power pack (8), acoustic control tester can trigger and sends song and flash by the mode of clapping one's hands.First acoustic control tester is put into tank, at tank, clap one's hands outward, in tank, acoustic control tester is triggered and has sent the experimenter flash of light that can see and the song that can hear.Then cover being screwed, with any one air-extractor of laboratory, air in tank is extracted out and gone, after most of air is extracted out, then close gas check valve, at this moment at tank, clap one's hands outward---in tank, acoustic control tester can not be triggered.Finally air valve is opened, then is clapped one's hands---acoustic control tester is just triggered easily.Illustrate that air valve one opens, 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.Proof air is the medium of Acoustic Wave Propagation and vacuum can not be transaudient.

Claims

1. demonstration air can conduct sound and vacuum can not be conducted a kind of acoustic control and the airborne sound experimental provision of sound, it is characterized in that: the glass jar of a with closure, on gland bonnet, arrange and there is manually opened and air valve closing function, in tank, place an acoustic control tester with sonic transducer, light emitting diode, loudspeaker and power pack, acoustic control tester can trigger and sends song and flash by the mode of clapping one's hands.