20 years of teaching

Chapter 216 Music Lessons

Wang Jiaxin, Li Minyao, and Yao Xiaodong had the most students around, and the three took the trouble to explain the correct answers to the six questions over and over again.

How is this like being in a classroom?It's messier than after school, like a cattle ranch.Liu Fuliang looked contemptuous, and said to Yin Qinsong who was sitting next to him: "What are you doing? This is a regular class time. The teacher must explain in detail and leave all problems to the students to solve. Why do you need the teacher?" ?”

Yin Qinsong said with a smile: "Let's not draw conclusions too early, listen to the whole class first, and then see how the effect is."

Try to let the students solve all the problems by themselves. If the students can't solve them, the teacher will help them solve them together.

The role of a teacher is to guide, not to indoctrinate. This is the most basic teaching principle taught to Lin Feifei by his instructor during his internship.

Therefore, in every physics class, Lin Feifan will arrange a part of time for students to study and discuss by themselves, so as to cultivate students' self-study ability.

The instructor also told him that the whole stage of basic education is actually to cultivate students' self-learning ability and good quality of loving learning.

If you have to rely entirely on teachers when you go to college, then your grades will definitely not be much better.

Live to be old, learn to be old, people have to keep learning throughout their lives, only by keeping learning can they make continuous progress, rise steadily, and become the trendsetter of the times.

Without the ability of self-learning, without the good quality of loving learning, what is the difference between a person who is ignorant and incompetent?It is bound to be eliminated by the society and become an outcast of the times.

Therefore, Lin Feifan attaches great importance to the cultivation of students' self-learning ability and excellent learning quality, and he also demands the same from himself.

Lin Feifan announced the end of the discussion time at the right time and entered the time for answering questions.

To the surprise of the seven people sitting in the last row listening to the class, Lin Feifan did not call out any students to answer the questions, but the students stood up to answer the questions on their own initiative, and almost all of them could answer the questions correctly and fluently out of the textbook.

Some students did not answer comprehensively, and someone immediately stood up and made supplements.

After nearly a month of training by Mr. Lin, all the students are familiar with the mode and process of Mr. Lin's class.

When a student stood up to answer a question, the other students listened quietly. The process of answering the six questions was orderly, fast and effective.

After the six problems were solved, Lin Feifan made some supplementary explanations. The content of the supplementary explanations was not in the textbooks. The way of explanations opened the eyes of Fang Yongzhi, who teaches physics.

Lin Feifan did a few small experiments first, and at the same time gave a detailed explanation to strengthen the knowledge the students just learned.

Strike the tuning forks of different sizes with the same intensity, and listen to the pitch of the pitch. It is found that the pitch of the tuning fork is shorter with the shorter the fork length.

Swipe the cardboard across the teeth of the comb, the first time slowly, and the second time quickly, Lin Feifei reminded the students to pay attention to the difference in the pitch of the sound made by the two vibrations.

This time the pitch of the pitch can not only be heard with the ears, but also seen with the eyes.

Obviously, the faster the stroke, the more times the sound source vibrates per second, the higher the frequency and the higher the pitch.

Lin Feifei made a summary and wrote on the blackboard that under the same structure, shape, and material, the larger the size of the sounding body, the lower the frequency and pitch of the sound.

For flake objects, the larger the area, the thicker the thickness and the lower the pitch.

For elongated objects, the longer the length and the larger the diameter, the lower the pitch of the sound.

Guzheng, for example, is a stringed instrument. The length and thickness of each string are different. Thin and short strings have a high pitch, while thick and long strings have a low pitch.

When playing songs with stringed instruments, the purpose of changing the pitch is achieved by changing the length of the strings and plucking strings with different thicknesses.

The pitch of a stringed instrument is also related to the tightness of the string, the tighter the string, the higher the pitch, and the looser the string, the lower the pitch.

The guitar is also called the six-stringed qin. The thickness of the six strings is different, and the pitch of the sound is different. Before playing, you need to use the timpani to adjust the tightness of the strings, so that the six strings can emit a sound of a specified pitch.

When playing, the purpose of changing the tone is achieved by pressing different grades with the left hand and plucking strings with different thicknesses with the right hand.

In 1978, the Zenghouyi Chime Bell was unearthed from the tomb of Zenghouyi in Leigudun, Suixian County, Hubei Province. It belongs to percussion instruments. The height and weight of each bell on the copper-wood structure bell stand are different, and the tones produced by the knocking are also different.

The most common percussion instrument is the drum. Drums of different sizes have different skin tightness and produce different tones when struck.

There are also wind instruments, such as flute, xiao, cucurbit silk, bawu, etc. Wind instruments rely on the vibration of the air column enclosed in the tube to produce sound. Dizi of different thicknesses have different tones, like the bangdi, which is used for the accompaniment of the northern bangzi opera. , the body of the flute is thin and short, the timbre is high-pitched, bright and powerful, and the pitch is very high.

The flute changes the tone by changing the length of the air column. There are 1 blow hole, 1 membrane hole, 6 sound holes, and 2 sound holes on the body of the flute. Press different sound holes with your fingers to change the length of the air. Make high and low sounds.

Lin Feifan concluded that, in fact, the content of this class has a lot to do with the subject of music, and learning the knowledge of this class is to serve the learning of music.

1234567 etc. in the numbered musical notation represent the pitch, and through the sound of the specified pitch by the musical instrument, coupled with the strength relationship and rhythm, beautiful music can be played.

With the central C key as do, the frequencies of 1234567 in the bass area are 261.63Hz, 293.66Hz, 329.63Hz, 349.23Hz, 392.00Hz, 440.00Hz, 493.88Hz.
The more than 70 people sitting below were all dumbfounded. How can this be a physics class?Obviously this is a music class!
I used to take a music class. In the music class, the teacher taught singing. When the teacher was tired, he would use a tape recorder to teach. The music teacher has never taught so much basic theoretical knowledge of music.

"Ms. Lin, can you play a song for us?" Wang Jiaxin stood up and asked, and she expressed the feelings of all the students.

Lin Feifan said: "Of course you can, but you don't just listen to it, you must combine what you hear and see with the knowledge I just said."

There was applause in the classroom, Mr. Lin is going to perform, this is so exciting!

Lin Feifan did not disappoint everyone. The next period of time became his recital. He first played "You at the Same Table" on the guitar, and then "Su Wu Shepherd" on the electronic organ, and then The flute played a section of "Journey to Gusu".

The boys looked at the various expressions of the girls, envious and jealous, looking forward to being as versatile as Mr. Lin, but that would be great, no worries that the girls won't like it!

The expressions of the girls are different, some are high-spirited, some are sad, some are intoxicated and don't know they are in class, and some are very excited...

Teacher Lin is not only handsome, but also so talented!
Teacher Lin, do you want to knock our girls into a coma?

snort!I hate you so much!
……

(End of this chapter)