"Strange Laser" PPT courseware

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"Strange Laser" PPT courseware

In this class we are studying "Strange Laser". After reading the topic, what questions do you have?

It seems that the students are all asking this question "strange". What does "strange" mean? What is so magical about lasers? Let’s read the text quickly!

Ask the students to read the text freely and read it smoothly and correctly, paying special attention to the pronunciation of new words. At the same time, take a look at what aspects of the text introduce the strange laser?

comminicate

① Read the first paragraph and the last paragraph and see how these two natural paragraphs are related to the full text?

②In what writing order are the texts explained?

Read it and compare.

①Do you know? Now the brightest light, the fastest knife, and the most accurate ruler in the world are lasers.

②Do you know? Now the brightest light in the world is a laser, the fastest knife is a laser, and the most accurate ruler is a laser.

Students are free to read the part "The Brightest Light" and see which sentences can best express that laser is the brightest light. Draw a picture, read it and think about it.

(1) For example, the light from the sun and electric lamps shines in all directions; although flashlights and searchlights can concentrate the light and emit it in one direction, this light still has to scatter in all directions after traveling a long distance. Laser has strong directionality, that is to say, it can focus its light in one direction.

(2) At its brightest, it is 10 billion times brighter than the sun!

(3) For example, if we look at the sun, we will feel temporarily dizzy; if we look at the laser, our eyes will be seriously damaged or even permanently blind.

Laser is not only the "brightest light", it is also the "fastest knife" and "the most accurate ruler". Are there any students who like these two parts? Who wants to talk about your experience?

Text summary

"Strange Laser" is an article that introduces popular science knowledge. The author uses the section method of total-point-total to describe the characteristics of lasers and show the role of lasers in life, using examples, Comparison and other explanation methods highlight the "singularity" of lasers.

The uses of lasers go far beyond these. Lasers can also be seen in our daily lives. Think about it, where can you see it?

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"Strange Laser" PPT download:

"Strange Laser" PPT Download Part One Content: First Reading Perception 1. Background Information Laser is another major invention of mankind since the 20th century, after atomic energy, computers, and semiconductors. It is known as the fastest knife and the most accurate. Rulers, the brightest light and strange lasers...

"Strange Laser" PPT:

"Strange Laser" PPT Part One Content: New Lesson Introduction What objects have you seen emitting light in your life? Electric lights and the sun, moonlight, lasers. Strange lasers. Strange: strange; special. (1) Check the pronunciation: j zn xun zhu tū gē distance temporarily ..

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Update Time: 2024-09-07

This template belongs to Chinese courseware Beijing Normal University Edition Fifth Grade Chinese Volume 2 industry PPT template

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