"How Light Spreads" Light PPT Courseware 3

Description

"How Light Spreads" Light PPT Courseware 3

Kind tips:

1. Fill out the experiment plan first

2. Experiment again and record your findings.

Important reminder: Do not point your eyes directly at a very bright light source.

Discussion: How are shadows produced and why are they always on the backlit side?

Light travels in straight lines. If light encounters an opaque object during its propagation, a dark area will be formed on the back of the object where light cannot reach it. This dark area is a shadow. Without light there would be no shadow.

Take home a question:

Can light travel in water?

If so, is it still linear propagation?

If so, does it spread at the same speed as in the air?

1. Light spreads in the form of ( ) in the air.

A curve B straight line C polyline

2. Light travels in the air at a speed of about ( ) per second.

A 30 kilometers B 300,000 kilometers C 340 meters

3. For the following analysis of the principle of shadow generation by objects, the correct one is ( )

A When light propagates, when it encounters an opaque object, part of the light will be blocked, and there will be a dark area on the backlit surface of the object, which is a shadow.

B When light propagates, when it encounters a transparent object, part of the light will be blocked, and there will be a dark area on the backlit surface of the object, which is a shadow.

4. The shadow is always on the ( ) side of the object.

A Aiming light B Backlight

5. In daily life, the following phenomena can prove that light propagates in a straight line: ( )

A. Car lights emit straight light at night. B. You can see the words on the book during the day.

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"How Light Spreads" Light PPT Download:

"How Light Spreads" Light PPT Download Part One Content: Introduction to the New Lesson In the early morning, the sun comes out and the room is filled with sunlight; at night, you turn on the flashlight and the light illuminates the road ahead. When light illuminates objects around us, have we ever thought about where it comes from and...

"How Light Spreads" Light PPT:

"How Light Spreads" Light PPT Part One Content: Experimental Exploration Exploration Content: 1. How does light propagate? 2. How are shadows formed? Light propagates dispersedly. Light propagates in a straight line. Light propagates in all directions... How does light propagate...

"How Light Spreads" Light PPT Courseware 5:

"How Light Spreads" Light PPT Courseware 5 Key points of the previous section: 1. The direction of the shadow of an object under sunlight changes with the change of the direction of the sun. The shadow is always opposite to the direction of the sun. 2. The change in the length of the shadow of an object under sunlight is As the sun's position in the sky changes...

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Update Time: 2024-11-24

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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