There is an event in history that has to do with resonance

The Israelites attacked the city of Medana.

The theory of resonance was proposed by Linus Carl Pauling.

Resonance theory is a molecular structure theory proposed by the American chemist Pauling, which is suitable for discussing some molecules that cannot be described in terms of valence bond (see chemical bond) structure, such as aromatic hydrocarbons such as benzene. At a certain historical time, many people in the chemical community believed that this theory was too subjective and arbitrary, and it was idealistic and metaphysical. However, this theory has been well applied in practice.

Basics: When a molecule or ion can write more than two Lewis structures according to the valence bond rule (the difference is only the distribution of bonds or electrons, while the position of the nucleus does not change), then the real molecular structure is the resonant hybrid of these structures, that is, the real structure of the molecule is the resonant hybrid.

Resonance hybrids have the characteristics of the sum of the above structures, but none of the resonant structures can represent the molecule alone; Nor can the individual resonance structures exist on their own.

Where a molecule or ion has a resonance, it is more stable than that without a resonance, and the more structures participating in the resonance, the more stable the hybrid is; In particular, if the formula with the same structure participates in the resonance, the hybrid is the most stable. Resonance structures with charge separation are less stable.

All its atoms have a structural formula with an intact valence electron shell and are relatively stable. The resonance structure of the negatively charged atom on the electronegativity is more stable.

Among the various resonance formulas, the formula with the lowest energy and similar structure accounts for the most probability, that is, the degree of participation is the greatest. Take allyl cation as an example: ch2=ch-ch2+ ch2-ch=ch2.

The concept of resonance energy is a procedure that indicates that a resonant hybrid is more stable than any single resonance structure.

Electron delocalization tends to make the molecule more stable with lower internal energy, and to measure this stability, resonance energy can be used. In the resonance structure, the lower the energy of the higher the number of covalent bonds, the more stable it is, and it has a greater chance of being in the hybrid.

The real structure of benzene is a euluminous bending vibrating hybrid formed by the resonance of eight structural formulas, and it should be pointed out that in the above example, all the formulas should be regular hexagonal carbon rings in a plane, and there can be no change, these resonance structures are actually hypothetical structures, and the difference between them is only in the hypothetical structure of the electron distribution, and the difference between them is only in the difference in the electron distribution.

After any object vibrates, due to its own physical characteristics such as composition, size, shape, etc., the vibration that originally started at multiple frequencies will gradually be fixed at a certain frequency, and this frequency is called the object's"Natural frequency", as it relates to the physical properties of that object. When people add another vibration (called instigation) to the object from the outside world, if the frequency of the instigating force is exactly the same as the natural frequency of the object, the amplitude of the object's vibration reaches its maximum, and this phenomenon is called"Resonance"。

Resonance is the frequency of the external force applied to the vibrating body is consistent with the vibration frequency of the vibrating body itself, so that the energy applied by the external force to the vibrating body can be accumulated, so that the vibration is continuously strengthened.

For example, swinging, pushing along the rhythm of the swing, you can swing higher and higher, which is the most intuitive example of resonance occurring.

Buildings and bridges also have their own vibration frequencies due to the characteristics of their structural materials, and if they resonate with external forces, energy will accumulate continuously, and there is a danger that they will eventually be destroyed beyond the amplitude limit that the design can bear.

What is the phenomenon of resonance? Five metronomes were placed on the same board, and an interesting phenomenon happened.

What is the phenomenon of resonance? Put 2 tuning forks on the same plane and an interesting phenomenon happens.

The phenomenon of resonance has been discovered in ancient China, and China was the first country in the world to discover this phenomenon. The phenomenon of resonance is recorded in a large number of ancient Chinese books. In "Lü's Spring and Autumn Period, There is a Beginning, and the Same Chapter", the resonance phenomenon is called "sound ratio should respond".

In the ancient book "Zhou Yi Qian", the resonance phenomenon is called "simultaneous correspondence". These two explanations of the phenomenon of resonance are almost identical to the current scientific definition.

What is the phenomenon of resonance? Put 2 tuning forks on the same plane and an interesting phenomenon happens.

When the applied frequency is equal to the natural frequency of the object, the phenomenon of the largest amplitude of the object occurs, which is the resonance...Hey....

The world's earliest book on the phenomenon of resonance is the Zhuangzi between the 3rd and 4th centuries B.C., which records the resonance between the strings of the ancient Chinese musical instrument. In the book's "Miscellaneous Chapters: Xu Wu Ghost", there is such a record: "For it, it is wasted in one hall and in one room."

The drum palace moves, and the drum horn moves. The rhythm is the same. The husband changed the tune of one string, and the five tones were not appropriate, and the drums were all moving.

The Se described here has 25 strings, and "Gong", "Shang", "Jiao", "Zheng", and "Yu" are the names of musical notes used by people in ancient China, which are equivalent to the current "Duo", "Rui", "Mi", "Fa", and "Shu". This transcript of the Zhuangzi played an important role in the later study of acoustics in China.

Answer: c Resonance occurs in forced vibrations and when the driving force frequency is equal to the natural frequency.