"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 2

Description

"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 2

learning target

1. Know that the speed of light is the propagation speed of electromagnetic waves and electromagnetic waves in vacuum.

2. Know the relationship between wavelength, frequency and wave speed.

3. Understand the generation and propagation of electromagnetic waves.

Read textbook P34-36 carefully and complete the following questions. (Time: 5 minutes)

The _________ of current in a conductor will stir up electromagnetic waves in space.

The distance between two adjacent wave crests (or wave troughs) is called ________, and the number of times that a wave crest (or wave trough) passes within 1 second is called the wave's _____________. The physical quantity used to express the speed of wave propagation is called ________.

The speed of electromagnetic waves in vacuum is approximately___________m/s.

The unit of frequency of electromagnetic waves is _______. Because the frequency of electromagnetic waves is usually very high, commonly used units are ____________ and __________.

According to the spectrum of electromagnetic waves, electromagnetic waves can be divided into _______________________________________ and so on.

Analysis of typical examples

[Example] In daily life, when you turn on or off the light, you will see a horizontal line on the screen of the TV set next to you, or hear a "click-click" noise from the radio next to you. This occurs. The cause of the phenomenon is ( )

A. Influence of metal collision sound in switches when current is switched on and off

B． The effect of alternating current flowing through a home circuit on a radio or television when the circuit is switched on and off

C. The impact caused by the electromagnetic waves emitted when the current is turned on and off and received by radios and televisions.

D． None of the above reasons are correct

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"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 3:

"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 3 Generation of Electromagnetic Waves Experiment Turn on the radio and tune to the channel of each station, take the battery and wires and place them next to the radio. One end of the wire is connected to one pole of the power supply, and the other end is intermittently in contact with the other pole of the power supply and the battery. ..

"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT courseware:

"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 1. Waves in Life Early Discovery of Electromagnetic Waves It has been a long process since humans discovered electromagnetic waves. It was not until the 19th century that the British physicist Maxwell predicted the existence of electromagnetic waves. In 1887, German material...

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Update Time: 2024-10-19

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

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