"The Process of Exploring the Microscopic World" PPT Courseware on Particles and the Universe 4

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"The Process of Exploring the Microscopic World" PPT Courseware on Particles and the Universe 4

Democritus's atomic theory lacked scientific experimental basis and was not recognized by people for a long time.

It was not until the 17th century that scientists represented by the "fathers of chemistry" Dalton and Boyle revived and established atomic theory through a large number of experiments.

In 1811, the Italian scientist Avogadro further pointed out that matter is generally not composed directly of atoms, but of molecules composed of several atoms combined.

discovery of electrons

In 1897, British physicist Thomson discovered that cathode radiation can be deflected under the action of an electric or magnetic field in the same direction as negatively charged particles, thus discovering electrons.

The discovery of electrons broke the concept that atoms are indivisible, was a leap forward in mankind's understanding of the structure of matter, and set off a new wave of exploration of the microstructure of matter.

Extracurricular extension

[Alpha particle scattering experiment] Final conclusion

Most scattering angles are very small, about 1/8000 scattering is greater than 90°; very few scattering angles are equal to 180°.

Positive charges are concentrated at the center of the atom.

nano technology

Nanotechnology is an emerging technology that emerged in the 1990s.

It is a brand-new technology that studies the movement patterns and characteristics of electrons, atoms and molecules in a space of 0.10 to 100 nanometers (one billionth of a meter).

Nano titanium oxide

Nano-titanium is corrosion-resistant. Objects coated with it can withstand boiling water and can be immersed in seawater for 10 years without damage. It also has miraculous self-healing capabilities and can be used as a general repair agent for metal and non-metal materials.

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"The Process of Exploring the Microscopic World" Particles and the Universe PPT Courseware 3:

"The Process of Exploring the Microscopic World" Particles and the Universe PPT Courseware 3 The Spark of Thinking Just as the green wall is composed of tree trunks and branches and leaves, the objects in nature are composed of invisible tiny particles and atoms. Atoms cannot disappear, but they cannot be created out of nothing. Democritus ..

"The Process of Exploring the Microscopic World" PPT Courseware on Particles and the Universe 2:

"The Process of Exploring the Microworld" Particles and the Universe PPT Courseware 2 Thomson's Atomic Model At the end of the 19th century, Thomson discovered electrons and knew that electrons are components of atoms. Since electrons are negatively charged, atoms are neutral. , so it is inferred that in the atom...

"The Process of Exploring the Microscopic World" PPT courseware on particles and the universe:

"The Process of Exploring the Microworld" PPT Courseware on Particles and the Universe Teaching objectives Understand the process of human understanding of exploring the microstructure of matter Understand the discovery process of electrons and the nuclear structure model of atoms Understand the quark model Understand the application of nanomaterials 1. The fire of thinking...

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Update Time: 2024-07-11

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