"The Ocean of Electromagnetic Waves" Information Transmission PPT Courseware 2

Description

"The Ocean of Electromagnetic Waves" Information Transmission PPT Courseware 2

teaching objectives

1. Understand the generation process of electromagnetic waves and the relationship between propagation rules, wave speed, wavelength and frequency.

2. Understand the application of electromagnetic waves: microwave oven.

generation of electromagnetic waves

Rapidly changing currents in conductors can stir up electromagnetic waves in space.

Demonstration experiment

Propagation of electromagnetic waves and the relationship between wavelength and wave speed

Electromagnetic waves can propagate in vacuum.

Speed: c=λf = 3×108 m/s (λ refers to wavelength, f refers to frequency.

The unit of frequency is Hertz (Hz). Commonly used units include kilohertz (KHz) and megahertz (MHz).

Application of electromagnetic waves: microwave oven

Self-study textbook P152: Microwave oven

answer the following questions

1. What does a microwave oven use to heat objects?

2. Why does the microwave oven have a metal casing and a metal mesh on the glass of the oven door?

Class exercises

1. When ______ occurs in a conductor, ______ is produced in the space around it.

2. The propagation speed of electromagnetic waves in vacuum is equal to ______m/s, which is the same speed as ______ propagation speed in vacuum.

3. The basic unit of frequency is Hz, 1MHz=______kHz=______Hz.

4. The wavelength range of TV channels 1 to 12 in my country is 1.37~5.71m, so their frequency range should be __~______MHz.

5. Electromagnetic waves with a wavelength of 300m belong to [ ]

A. Long wave b. Medium wave c. short wave d. microwave

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Update Time: 2024-09-28

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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