The physics teacher s demonstration of the paper cup phonograph became popular, what is my response

A good education is one that can organically combine the phenomena in daily life with the theoretical knowledge in books, so that students can understand the knowledge points simply and clearly.

Recently, in Ganzhou, Jiangxi Province, China, there is a middle school physics teacher through the demonstration of "paper cup phonograph" on the Internet, in the ** can be seen that the teacher used the principle of the phonograph to successfully use a paper cup and a steel needle to demonstrate the sound principle of the traditional phonograph.

We all know that the transmission of sound requires vibration, and after the transmission of sound waves, it needs to cause the medium to vibrate in order to continue to propagate, and the metal needle is connected to one end of the radio, and the other end is connected to the wax bucket wrapped with tin foil, when the person at one end makes a sound to drive the medium to vibrate, then the metal needle can engrave the sound on the wax cylinder, using this principle Edison invented the phonograph.

In this regard, the teacher said that the paper cup phonograph was designed by his friend and not a new invention, and he hoped to make the "paper cup phonograph" for teaching demonstration in the classroom, so that students and the public can know the importance of innovation and invention in this form.

As we all know, the phonograph can be divided into several categories, such as box phonograph, desktop loudspeaker, vertical phonograph, cabinet phonograph, professional audiophile phonograph, etc., the traditional phonograph is an electric device used for record recording, invented by the American inventor Edison in 1877.

The invention of the phonograph is known as one of Edison's greatest inventions because the traditional phonograph record could be reproduced in large quantities in an easy way, and the duration was longer than most barrel recording media. The working principle of the gramophone is to store the sound information in the arc groove on the flat surface of the record, and place the record on the turntable at the time, and carry out the work as the stylus rotates.

Historically, all inventions and innovations have been made through continuous experimentation and thinking, so it is more important for students to understand the importance of thinking and innovation in the teaching process than just theoretical education.

The teacher creates a paper cup phonograph, uses the real object to teach, and tells the students and the public to know that there is a sense of innovation and invention through experiments.

The physics teacher demonstrated that the paper cup phonograph became popular, and the teacher himself said: "The paper cup phonograph" was designed by a friend, not a new invention, but the use of the previous working principle of the gramophone, and made it for teaching, so that students and the public know that there should be a sense of innovation and invention through experiments.

The physics teacher responded that the paper cup phonograph was designed by a friend to attract students' curiosity and improve students' enthusiasm for learning physics.

I said that I did this to let students know that they must be innovative.

Physics teacher demonstrates paper cup phonographThe working principle of the gramophone was adopted

A phonograph is a primitive sound playback device in which sound is emitted by vibration, and when the sound waves are transmitted, they cause the same vibration of the object. Attach one end of the metal pin to the radio and the other end to a wax cylinder wrapped in tin foil. When a person makes a sound and causes vibrations, a metal needle can engrave the "sound" on the wax cylinder, and using this principle, Edison invented the phonograph.

According to the same principle, a middle school physics teacher in Ganzhou, Jiangxi Province, has also made a simple phonograph device. He fixed a steel needle on the bottom of the paper cup, and when he spoke to the paper cup, the vibration of the sound caused the vibration of the bottom of the cup, and the altered steel needle scratched marks on the plastic; When reducing, let the tip of the steel needle be placed on the channel channel, and then turn the cup to drive the bottom of the paper cup to vibrate, and then restore the sound.

The energy of the sound is converted into the vibration of the metal needle at the bottom of the paper cup, and the needle leaves a wave-like nick on the rotating plastic cup, and when the plastic cup rotates again, the needle in the nick will move (vibrate) with the wave-like nick, so that the paper cup emits the same sound as the original vibration law (distortion is inevitable).

The physics teacher made a simple gramophone device using paper cups through the principle of a phonograph.

I believe you have also brushed up on this news recently, a physics teacher in a middle school in Ganzhou, Jiangxi Province, Zhu Xiangyang successfully used a paper cup phonograph to successfully leave a phonograph and became popular on the Internet.

According to the principle of the previous phonograph, a middle school physics teacher in Ganzhou, Jiangxi Province, also made a simple phonograph device. He fixed a steel needle on the bottom of the paper cup, spoke to the paper cup, the vibration of the sound caused the vibration of the bottom of the cup, and the steel needle fixed at the bottom of the cup drew marks on the plastic; When reducing, put the tip of the steel needle on the vocal channel, and then turn the cup to drive the bottom of the paper cup to vibrate, and then restore the sound.

When recording, the sound causes the bottom of the paper cup to vibrate, and the bottom of the cup drives the steel needle to vibrate with the sound, and the vibrating steel needle depicts the traces of sound vibration on the rotating paper cup. When playing, the steel needle on the moving channel is vibrated by the sound signal originally recorded by the channel and drives the paper cup to vibrate and make sound.

This is a very interesting acoustic phenomenon experiment, although the phonograph has long been available, and now it has been eliminated, the use of simple equipment to make with the interesting function of recording and playback, as the experimental material of popular science, especially science teaching, is to cultivate students' ideological innovation consciousness and hands-on practical ability through experiments.

Mr. Zhu said that this experiment is not a new invention, the principle of the gramophone has been invented a long time ago, and it is mainly used for teaching, and the teacher said that the "paper cup phonograph" was designed by a friend and used for him to do experimental research and teaching. The reason why the "paper cup phonograph" is made on the principle of the phonograph is to let students and the public know that they must have a sense of innovation and invention.

The physics teacher uses the working principle of the previous phonograph and makes it for teaching.

According to the sound of the recording studio, drive the bottom of the paper cup and drive the steel needle as the audio vibration, the needle tip leaves traces of audio vibration on the rotating plastic cup to become the sound, and when the sound is played, the needle tip is forced to vibrate on the moving channel channel, and drives the bottom of the cup as the audio vibration to restore the sound

Using the law that "sound causes objects to vibrate", the vibration information of sound is recorded with a paper cup and a steel needle, or engraved on plastic, and the sound is stored. Then, in turn, this information is scored through the steel needle to re-cause the paper cup to vibrate, and the sound of storing it is emitted.

How exactly does a paper cup phonograph do it?

According to the introduction of the physics teacher:

The working content of the gramophone is to record and play the sound to cause the bottom of the paper cup to vibrate, and the bottom of the cup drives the steel needle to vibrate with the sound, and the traces of sound vibration are depicted on the rotating paper cup, and then the steel needle on the moving channel is subjected to the original recorded sound of the channel channel, which eventually causes the signal to vibrate and drive the paper cup to vibrate and make sound.

That is to say: when you fix a steel needle on the bottom of the paper cup and speak to the paper cup, the vibration of the sound causes the vibration of the bottom of the cup, and the modified steel needle traces under the plastic; When reducing, let the tip of the steel needle be placed on the vocal channel, and then turn the quilt to drive the bottom of the paper cup to vibrate, then what you said at the beginning will be transmitted.

The above is the principle of phonograph production, so it is very important for students to learn physics well, not only to expand their thinking, but also to give full play to their wisdom in daily life to make some small inventions.

Isn't that amazing? Do you want to make your own gramophone?

Here's a rough rundown of how to make a needle phonograph by hand.

Materials and tools to prepare:

1.a disc on which records can be placed;

2.the motor and belt of the tape machine, some runners;

3.a sewing needle;

4.brackets made of aluminum;

5.a copper bar;

6.a beverage bottle;

A mobile phone charger that is used as a motor power supply (the old-fashioned one is hand-wound turned).

And then the next is:

The old record tape player took off the motor, the belt and some runners, and the motor drove the runner to slow down once.

The runner drives the disc to decelerate twice to achieve the speed and constant speed required by the record.

A large disc of the record.

Solidify the sewing needle on the tip of the copper bar, which is the cartridge (pick-up capsule).

Then insert the other end into the cap of the beverage bottle to create a resonance, this is the horn.

Thread a small hole in the end of the bottle and prop it up, so that the cartridge can be panned inside and out on the turntable, so that a rudimentary gramophone is DIY.

Try it now!

The experimental principle is based on the sound driving the bottom of the paper cup and driving the steel needle to make audio vibration during the recording, and the needle tip leaves an audio vibration notch on the rotating plastic cup to become the sound channel. When playing sound, the tip of the needle is forced to vibrate on the moving channel and drives the bottom of the paper cup to vibrate audio, so as to restore the sound.

When you fix a steel needle on the bottom of the paper cup and speak to the paper cup, the vibration of the sound causes the vibration of the bottom of the cup, and the modified steel needle marks on the plastic; When reducing, let the tip of the steel needle be placed on the vocal channel, and then turn the quilt to drive the bottom of the paper cup to vibrate, then what you said at the beginning will be transmitted. Success can be achieved through the principle of phonograph production.

It was made according to physical theories, and many instruments at that time were made from small objects in daily life.

Sound waves cause objects to vibrate, and the sound is stored by recording the vibration information generated by the sound with a paper cup and a steel needle. Then, in turn, this information is passed through the steel needle to re-cause the paper cup to vibrate, and the sound of storing it is emitted.