Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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ПИЗА ДАЙЫНДЫ0 ТАПСЫРМАЛАРЫ қазақша
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- Tasks 14.
ХNa Х NaОН Answer: . Tasks 13. The electromagnetic waves. The huge territory of Kazakhstan also contributes to the development of satellite TV - Television Without Borders. A great help in this direction is the Kazakhstan cosmodrome "Baikonur" - Centre for the launch of space rockets. Thanks to the satellite TV system "Zharyk" has become possible to transmit television programs of Astana and Almaty, in all regions of Kazakhstan, as well as to cover the peripheral portion of broadcasting Russia, Uzbekistan, China, and Mongolia. Kazakh satellite «KazSat-1», «KazSat-2», «KazSat-3" satellite communications provide the republic, as well as the digital TV and radio broadcasting. The spacecraft «KazSat-3" was placed in an intermediate orbit in April 2014 and is intended to provide telecommunication services, television and high speed Internet access on the territory of Kazakhstan and neighboring countries. With the development of improved technology equipment communications. For example, to replace a simple telephone come digital telecommunications systems have tremendous functionality. Figure 15 Question. Try to explain the impact of the development of means of communication and human life activity? Answer: . Tasks 14. The electromagnetic waves. Science has shown that in all consumer electronics applying varying degrees generates electromagnetic waves of different frequencies. Electronic emission has become a new environmental disaster of global scale. Question. How to influence the electromagnetic field of overhead power lines to people, animals and plants? Answer: . Task 15: Hertzian wavesSources of artificial electromagnetic radiations, which include aerial power lines of high and super-high voltage, technical equipment of broadcasting, television, microwave and satellite communication, radar and navigation systems, laser beacons, household appliances - Wi-Fi, microwave ovens, monitors, and others. Significantly affected on natural electromagnetic background. In large areas, especially in the vicinity of passage of the overhead power lines of high and super-high voltage, radio and TV centers, radar installations, electric and magnetic fields has increased from two to five orders of magnitude, creating a real threat to people, flora and fauna. Sanitary limiting dose of the electric field is 1 volt per meter. The high-voltage power lines exceeding this dose observed at distances of up to a dozen, sometimes up to hundreds of meters. Surveys indicated that standing under a power line for 15 minutes three times a day for six days cause of neurological changes, decreased brain health. In areas where there are high-voltage power lines, electrostatic field strength can be up to several thousand volts for 1 m. The influence on the human body of high frequency electromagnetic waves (from 3 kHz to 300 GHz) of radio and television dependent from its frequency. The higher frequency or the shorter wavelength, the greater the impact. High-frequency ultrasound, high-intensity laser beams very strong influence on the human brain. If they are not used for peaceful purposes, the impact of psychotropic weapons can change the cerebration: deteriorating memory, disturbed coordination of movements, appears an inadequate response to what is happening around. Question: What everyone should know in order to no harm to health? Answer: жүктеу/скачать 3,11 Mb. Достарыңызбен бөлісу:
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