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Консультация № 194760
21.02.2019, 19:26
0.00 руб.
26.02.2019, 14:00
0
2
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
1. При каком значении проводимости среды в неё будет проникать [$627$]=10-6 от интенсивности падающей из вакуума волны с частотой f=10 МГц? Магнитная проницаемость среды [$956$]=1.
1. При каком значении проводимости среды в неё будет проникать [$627$]=10-6 от интенсивности падающей из вакуума волны с частотой f=10 МГц? Магнитная проницаемость среды [$956$]=1.
Обсуждение
26.02.2019, 14:20
общий
это ответ
Здравствуйте, dar777!
Поскольку в условиях задачи не указан угол падения волны, будем считать, что волна падает перпендикулярно границе раздела. Тогда коэффициент прохождения электромагнитной волны по амплитуде определяется выражением
где
- волновое сопротивление вакуума,
- волновое сопротивление проводящей среды с магнитной проницаемостью [$956$] и проводимостью [$963$] на частоте f. С учётом этого можно записать
откуда
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Согласно условию интенсивность электромагнитного излучения в проводящей среде составляет 10[sup]-6[/sup] от интенсивности в вакууме. Поскольку интенсивность излучения пропорциональна квадрату амплитуды, то коэффициент прохождения по амплитуде составит 10[sup]-3[/sup]. Тогда для частоты f = 10 МГц = 10[sup]7[/sup] Гц будем иметь
Поскольку в условиях задачи не указан угол падения волны, будем считать, что волна падает перпендикулярно границе раздела. Тогда коэффициент прохождения электромагнитной волны по амплитуде определяется выражением
где
- волновое сопротивление вакуума,
- волновое сопротивление проводящей среды с магнитной проницаемостью [$956$] и проводимостью [$963$] на частоте f. С учётом этого можно записать
откуда
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Согласно условию интенсивность электромагнитного излучения в проводящей среде составляет 10[sup]-6[/sup] от интенсивности в вакууме. Поскольку интенсивность излучения пропорциональна квадрату амплитуды, то коэффициент прохождения по амплитуде составит 10[sup]-3[/sup]. Тогда для частоты f = 10 МГц = 10[sup]7[/sup] Гц будем иметь
5
Это самое лучшее решение!
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