"The Wider and Broader Information Road" Information Transmission PPT

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"The Wider and Broader Information Road" Information Transmission PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Microwave communication

1. Information theory shows that the higher the frequency of the electromagnetic wave as the carrier (optional "higher" or "lower"), the more information can be transmitted in the same time.

2. Regarding whether the moon can be used as a microwave relay station, which of the following statements is wrong (B)

A. The moon is a satellite of the earth and can reflect microwaves

B. Microwave information can be transmitted through the moon between any two points on the earth.

C. The moon is too far away from the earth. If the moon is used as a microwave relay station, the time delay will be long.

D. The moon is too far away from the earth. If the moon is used as a microwave relay station, the signal will attenuate significantly and affect the communication quality.

Knowledge Point 2 Satellite Communications

3. In satellite communications, at least a few satellites are needed to cover almost the entire earth (B)

A.1 B.3

C.5 D.6

4. Regarding satellite communications, which of the following statements is correct (B)

A. Satellite communication uses satellites to transmit electromagnetic waves to the ground.

B. A communication satellite is equivalent to a space microwave relay station, used to forward signals sent by ground stations.

C. Satellite communications send broadcast signals

D. Satellite communication to receive TV signals

Knowledge point 3: Optical fiber communication

5. Optical fiber communication uses laser light to enter from one end of the optical fiber and emit from the other end to transmit information.

6. We often hear the term "information highway" in the media, which mainly refers to (B)

A.High-speed highway B.Communication using optical fiber

C. Communication using microwaves D. Communication using satellites

7. Regarding optical fiber communication, which of the following statements is wrong (A)

A. In optical fibers, light waves propagate forward after multiple refractions.

B. The "wire" used in optical fiber communication is optical fiber

C. The energy loss of optical fiber is much smaller than that of general communication cables

D. Optical fiber communication can transmit a large amount of information within a certain period of time

Knowledge point 4 Network communication

8. Network communication connects many computers together for communication. Commonly used forms of network communication include email, QQ, WeChat, etc.

9. Xiaohong has recently learned to surf the Internet. Her email address is Xiaohong-168@163.com, which means that this email address belongs to Xiaohong-168, and the email server is called 163.com.

The increasingly wider road to information PPT, part 2: improvement of comprehensive capabilities

10. Recently, the Qingdao Summit of the Shanghai Cooperation Organization has attracted worldwide attention. The live broadcast of the summit using satellites uses electromagnetic waves to transmit information.

11. Optical fiber communication uses electromagnetic waves (optional "electromagnetic waves" or "ultrasonic waves") to achieve information transmission by multiple reflections (optional "reflection", "refraction" or "linear propagation") in the optical fiber. It has the ability to transmit information It has the advantages of large quantity, high communication quality, and no interference from external electromagnetic fields.

12. Live TV often responds "sluggishly" because electromagnetic waves take time to propagate; if the distance between the football match site and the TV set is 3.6×108 m from the communication satellite, the signal will be delayed by at least 2.4s.

13. Telephone communication and network communication have many similarities. Figures A and B show the working principles of the two communications. Comparing the two, we can find that the telephone switch in telephone communication is equivalent to the server in network communication. Network communication The computer in is equivalent to the telephone in telephone communication.

14. Which of the following statements about geostationary communication satellites is incorrect (A)

A. The synchronous satellite is in equilibrium

B. Conservation of mechanical energy of synchronous satellites

C. Synchronous satellites are stationary relative to the ground

D. Geostationary satellites use microwaves to communicate

15. Xiao Ming’s computer exchanges information with the Internet through optical fiber. The carrier of information transmission through optical fiber communication is (D)

A.Current B.Ultrasound

C. Radio waves D. Light waves

16. Regarding email, which of the following statements is correct (B)

A. You must enter your own email address to send an email

B. To send an email, you must enter the other party’s email address.

C. E-mail is a space on a user’s computer

D. If the other party’s computer is not turned on, the email cannot be sent.

17. The function that the Internet cannot realize is (C)

A. Check information, watch news B. Shopping, video, chat

C. Cash transaction D. Distance education, telemedicine

18. Which of the following statements about computer networks is correct (C)

A. It is impossible for several computers in the same office to establish a network

B. Connect several computers directly with signal lines to form a network

C. Network communication can transmit text information, as well as image and sound information.

D. Using a laptop for wireless Internet access does not constitute network communication.

19. Which of the following statements is correct (B)

A.Microwaves can be diffracted along the earth’s surface

B. The period of rotation of synchronous communication satellites around the earth is the same as the period of the earth's rotation.

C. In optical fiber communication, ordinary light can also be used to propagate in optical fibers.

D. The greater the speed of radio waves, the more information can be transmitted in the same time

The road to information is getting wider and wider PPT, the third part: Expansion, exploration and breakthrough

23. Drill a small hole in the side wall of a large colorless plastic bottle near the bottom, stick the hole with tape, fill the bottle with water, put a laser flashlight on the other side of the bottle, and adjust the beam direction, so that the beam can hit the small hole on the opposite side (as shown in the picture). Take off the tape and let the water flow into the basin below. You will see the light shining on the bottom of the basin with the curved water flow, creating a light spot on the bottom of the basin.

(1) In this experiment, the beam of the laser flashlight is reflected multiple times along the inner (optional "inner" or "outer") wall of the water flow (optional "reflection" or "refraction"), and finally hits the pelvic floor. ;

(2) The water column flowing out of the bottle in the experiment is equivalent to the optical fiber in laser communication; this means that the conduit used for laser communication can (optional "can" or "cannot") bend;

(3) Conjecture: In laser communication, each tube can (optional "can" or "cannot") conduct multiple laser signals at the same time without interfering with each other.

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Update Time: 2024-09-30

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