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

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Lu Jiao Edition Ninth Grade Physics Volume 2	pptx	6 MB

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

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Description

"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.

Phenomenon

The radio makes a "click" sound

in conclusion

Rapid changes in current in a wire create an electric current in the air

propagation of electromagnetic waves

Get to know waves:

(1) Wavelength: the distance between two adjacent wave crests (or troughs).

Unit: m

(2) Frequency: The frequency of the wave is the number of times the wave peak or trough passes within 1 s.

Unit: Hertz (Hz)

(3) Wave speed: how fast the wave propagates.

Unit: meters/second

Class summary

Rapid changes in current in a wire can stir up electromagnetic waves in space.

Electromagnetic waves can propagate in media as well as in vacuum.

The propagation speed of electromagnetic waves in vacuum:

c≈3×105 km/s

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For more information about the PPT courseware "Electromagnetic Waves: Generation and Propagation of Electromagnetic Waves", please click on the "Electromagnetic Waves ppt: Generation and Propagation of Electromagnetic Waves" ppt tag.

"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,...

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