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Консультация № 179316
27.06.2010, 14:01
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543. Радиолокатор обнаружил в море подводную лодку, отраженный сигнал от которой дошел до него за время t = 36 мкс. Учитывая, что диэлектрическая прони-цаемость воды = 81, определить расстояние от радиолокатора до подводной лодки
Обсуждение
03.07.2010, 08:03
общий
03.07.2010, 21:52
это ответ
Здравствуйте, noobjkee.
В среде с диэлектрической проницаемостью ε и магнитной проницаемостью μ скорость распространения электромагнитного поля равна
v = c/√(εμ). Поэтому за время t отраженный сигнал пройдет расстояние s = ct/√(εμ). После подстановки численных значений величин получим
s = 3 ∙ 108 ∙ 36 ∙ 10-6/√(81 ∙ 1) = 1,2 ∙ 103 (м) = 1,2 км. !? 36 мкс - это время от момента посылки сигнала радиолокатора до момента получения отражённого сигнала; т.о. искомое расстояние от радиолокатора до подводной лодки сигнал прошёл дважды, и, сл-но это, расстояние равно 1200/2 = 600м.
С уважением.
В среде с диэлектрической проницаемостью ε и магнитной проницаемостью μ скорость распространения электромагнитного поля равна
v = c/√(εμ). Поэтому за время t отраженный сигнал пройдет расстояние s = ct/√(εμ). После подстановки численных значений величин получим
s = 3 ∙ 108 ∙ 36 ∙ 10-6/√(81 ∙ 1) = 1,2 ∙ 103 (м) = 1,2 км. !? 36 мкс - это время от момента посылки сигнала радиолокатора до момента получения отражённого сигнала; т.о. искомое расстояние от радиолокатора до подводной лодки сигнал прошёл дважды, и, сл-но это, расстояние равно 1200/2 = 600м.
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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