"The Ocean of Electromagnetic Waves" Information Transmission PPT Download

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"The Ocean of Electromagnetic Waves" Information Transmission PPT Download

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1: Generation of electromagnetic waves

1. Regarding the generation of electromagnetic waves, which of the following statements is correct ()

A. If there is current in the wire, electromagnetic waves can be excited in space.

B． Even if there is no current in the wire, electromagnetic waves can be excited in space.

C. If there is a rapidly changing current in the wire, electromagnetic waves can be excited in space.

D. Electromagnetic waves can be generated in the above three situations

Knowledge point 2 Propagation of electromagnetic waves

2. Which of the following statements about electromagnetic waves is correct ()

A. The propagation of electromagnetic waves requires a medium

B． Electromagnetic waves propagate far away in space along a specific direction

C. On the moon, astronauts cannot hear face-to-face conversations, but rely on wireless phones to talk

D. Water waves and sound waves are natural phenomena, while electromagnetic waves are man-made phenomena.

3. Two places thousands of miles apart can achieve rapid exchange of information with the help of satellites. At this time, information is spread by ________. Satellites are operating normally in space, which shows that this kind of wave ________ (optional "can" or "cannot" ) propagates in a vacuum.

Knowledge point 3 Application of electromagnetic waves

4. With the rapid development of science and technology, electromagnetic waves have been widely used. Among the electrical equipment shown in Figure 21-2-1, the ones that use electromagnetic waves to work are ()

5. (Multiple choice) There are many members of the electromagnetic wave family, including radio waves, infrared rays, visible light, ultraviolet rays, X-rays, etc. Electromagnetic waves are inseparable from people's lives and have penetrated into every aspect of people's lives. Regarding the application of electromagnetic waves, which of the following statements is correct ()

A. Money detector uses infrared light to identify the authenticity of banknotes

B． Mobile phones use electromagnetic waves to transmit signals

C. TV remote control uses ultraviolet light to remotely control the TV

D. Microwave ovens use electromagnetic waves to heat food

Ocean PPT of electromagnetic waves, part 2: Comprehensive practice of B-law method

6． Which of the following statements about electromagnetic waves is correct ()

A. Electromagnetic waves can only transmit information

B． Ultrasonic waves, microwaves, and light waves are all electromagnetic waves

C. Phones use electromagnetic waves to transmit information

D. Electromagnetic waves are invisible and intangible, but they exist objectively

7． Regarding electromagnetic waves and sound waves, which of the following statements is correct ()

A. Both electromagnetic and sound waves can transmit energy

B． Both electromagnetic and sound waves can propagate in a vacuum

C. X-rays and ultrasound travel at the same speed

D. When talking on a mobile phone, only sound waves are used to transmit information

8. As shown in Figure 21-2-2, Xiaoyu turns on the switch of the radio, adjusts the FM knob to the position where there is no radio station, takes an old dry battery and a wire, connects one end of the wire to one pole of the battery, and then When the other end of the wire is intermittently contacted with the other pole of the battery, you will hear a "click" sound from the radio. This phenomenon indicates that ________ current can produce ________.

9. Modern society is inseparable from electromagnetic waves. Wireless broadcasts, mobile phone communications, and satellite navigation all rely on electromagnetic waves to transmit information. The Wi-Fi signal we often call is a kind of electromagnetic wave. The propagation speed of this signal in a vacuum is ________km/ s; The TV remote control controls the TV by emitting a kind of electromagnetic wave, which is called ________.

Ocean PPT of Electromagnetic Waves, Part 3: Practical Practice of C High Frequency Examination Questions

10．2017·Suqian Regarding electromagnetic waves, which of the following statements is correct ()

A. Light waves are not electromagnetic waves

B． Electromagnetic waves can transmit information

C. Electromagnetic waves cannot propagate in a vacuum

D. Electromagnetic waves cannot be seen or touched, but they can be heard

11．2018·Neijiang Among the electromagnetic wave family listed below, the one with the highest frequency is ()

A. Radio waves b. infrared

C. Ultraviolet rays D. X-ray

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Update Time: 2024-10-02

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