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"Test in this Chapter" Information Transmission PPT
1. (Jiangxi High School Entrance Examination) Before riding a shared bicycle, you need to scan the code with your mobile phone to transmit the information to the sharing platform through electromagnetic waves. The sharing platform then transmits the unlocking information to the bicycle at a speed of 3×108m/s for unlocking.
2. (Guiyang High School Entrance Examination) Talking on mobile phones and speaking face-to-face are both ways of communicating information. The former mainly relies on electromagnetic waves to transmit information, and the latter mainly relies on sound waves. From the perspective of the form of energy transfer, electromagnetic waves transfer electrical energy, and sound waves transfer acoustic energy.
3. (Tianshui Examination) The waveform of a certain electromagnetic wave is as shown in the figure. The wavelength of the electromagnetic wave is 1 m and the frequency is 3×108 Hz.
4. (Heze High School Entrance Examination) At 5:28 on May 21, 2018, China launched the "Queqiao" relay satellite from the Xichang Satellite Launch Center. The successful launch of the "Queqiao" relay satellite has solved the problem that the detector on the back of the moon cannot directly conduct measurement, control, communication and data transmission with the earth. The reason why the detector on the back of the moon cannot directly conduct measurement, control, communication and data transmission with the earth is that the microwaves that transmit information propagate in straight lines. If the "Queqiao" relay star is positioned at the Lagrangian L2 point, which is on the back side of the moon and is stationary relative to the Earth and the moon, then it is moving (optional "stationary" or "moving") relative to the sun.
5. (Dalian High School Entrance Examination) The correct statement about telephone exchanges is (A)
A. The emergence of telephone exchanges has greatly improved the utilization rate of telephone lines.
B. When making a call, the "busy" message must be because the other party's phone is in use.
C. Early telephone exchanges relied on operators to manually connect and disconnect connections, which was highly efficient.
D. Modern program-controlled telephone exchanges use electromagnetic relays for wiring
6. (Neijiang High School Entrance Examination) Among the electromagnetic spectrum families listed below, the one with the highest frequency is (D)
A. Radio waves B. Infrared rays
C. Ultraviolet rays D. X-rays
7. (Huaihua High School Entrance Examination) Among the following technical applications, the one that does not use electromagnetic waves is (D)
A. Use microwave radar to track flying targets
B. Use Beidou navigation system for positioning and navigation
C. Make a call on your mobile phone
D. Use sonar system to detect seabed depth
8. (Kunming High School Entrance Examination) Among the following statements, the correct one is (B)
A. The higher the frequency of electromagnetic waves, the greater the speed of propagation
B. Electromagnetic waves can propagate in vacuum
C. Calls between mobile phones are transmitted by ultrasonic waves
D.Microwaves have no energy
9. (Yiyang High School Entrance Examination) The Beidou Satellite Navigation System is a global satellite positioning and communication system independently developed by my country. It has initially provided regional navigation, positioning and timing functions. Once fully completed, it can provide users with high-precision and high-reliability positioning, navigation, and timing services around the world, all day and night, and has short message communication capabilities. Which of the following statements about the Beidou satellite navigation system is correct (A)
A. The Beidou satellite navigation system transmits information at the same speed as the speed of light.
B. The space segment of the Beidou satellite navigation system uses optical fiber to transmit information
C. Beidou satellite navigation system uses ultrasonic waves for car navigation
D. The Beidou satellite navigation system is now fully completed
10. (Urumqi High School Entrance Examination) A synchronous communication satellite is a satellite that operates in a circular orbit (synchronous orbit) with an altitude of 3.6×107 m above the ground and rotates around the center of the earth. Its operating period is the same as the earth's rotation period.
(1) When a synchronous communication satellite orbits the earth, it is subject to (optional "receive" or "not") the earth's gravity, and the period is 24 hours. Synchronous communication satellites are stationary relative to buildings on the ground. Three synchronous communication satellites can basically achieve global communication;
(2) Theory and practice show that synchronous communication satellites with different qualities all run in synchronous orbits at the same speed. If the antenna on the synchronous communication satellite falls off, the antenna will still (optional "still" or "will not") in synchronization run on track;
(3) Two people A and B on the ground use satellite phones to communicate through synchronous communication satellites. It takes at least 0.48s from the time A sends a signal to when he receives the automatic reply signal from B.
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