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

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

1. Waves in life

Early discovery of electromagnetic waves

The discovery of electromagnetic waves by humans has gone through a long process. It was not until the 19th century that the British physicist Maxwell predicted the existence of electromagnetic waves.

In 1887, German physicist Hertz experimentally confirmed the existence of electromagnetic waves.

2. Experience electromagnetic waves

Activity 1 Electromagnetic waves around us

in conclusion

When there is a rapidly changing current somewhere in a conductor or circuit, electromagnetic waves propagating outward will be generated in the surrounding space.

The relationship between wave speed, wavelength and frequency:

Wave speed = wavelength × frequency

C=λf

Class exercises

1. What do you think about electromagnetic waves ( )

A. The higher the frequency, the faster it spreads.

B. The lower the frequency, the faster it spreads.

C. The wavelength of electromagnetic waves is related to the propagation speed.

D. The speed of electromagnetic waves has nothing to do with frequency or wavelength.

2. Radio communication is ( )

A. Transmit signals through the air.

B. Transmit signals with the help of the earth.

C. No need to use any material to transmit signals.

D. Transmit signals with the help of electromagnetic waves.

3. Sounds and smells are commonly used information for animals, but humans have some unique information, such as language. The development of electromagnetism allows people to use electromagnetic waves to transmit information. The electromagnetic wave frequency used by the first artificial satellite launched by our country is about 2×107Hz, and its corresponding wavelength is _____ meters.

After-school exercises

1. Go online or go to the library to read up on the impact of electromagnetic radiation on human health and protective measures, and communicate with classmates.

2. Understand the radiation standards of mobile phones in my country.

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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 2:

"Generation and Propagation of Electromagnetic Waves" Electromagnetic Wave PPT Courseware 2 Learning Objectives 1. Know that the speed of light is an electromagnetic wave and the propagation speed of electromagnetic waves in a vacuum. 2. Know the relationship between wavelength, frequency and wave speed. 3. Understand the generation and propagation of electromagnetic waves. Read carefully Textbook P34-36,...

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Update Time: 2024-11-22

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

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