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Здравствуйте! У меня возникли сложности с таким вопросом:
1)Абсолютно чёрное тело находится при температуре 2100 К. В результате остывания длина волны, соответствующая максимуму испускательной способности, изменилась на 9 мкм. До какой температуры охладилось тело?
2)Электрон движется по окружности радиусом 2 мм в магнитном поле 1 мТл. Определите длину волны де Бройля этого электрона.
3)Найдите частоту света, вырывающего из металла электроны, которые полностью задерживаются разностью потенциалов 1.5 В. Фотоэффект начинается при частоте света 750 ТГц.
4)Какая часть свободных электронов в металле имеет при 0 К кинетическую энергию, превышающую 0.65 максимальной?
5)Определите температуру, при которой вероятность найти в металле электрон с энергией 0.09 эВ над уровнем Ферми равна 4.5%.
6)Во сколько раз увеличится удельное сопротивление металла при увеличении температуры от 290 K до 350 K?
Если вы хотите получить ответ на ваш вопрос - соблюдайте правила портала особенно в части: Цитата: Не задавайте несколько разных вопросов в одном
Не задавайте несколько разных, не связанных с друг другом вопросов, в одном. Это не запрещено (если все вопросы относятся к теме рассылки), но вероятность того, что Вы получите на них ответы, будет гораздо выше, если Вы зададите их по отдельности. Например, мало кому из экспертов захочется отвечать на вопрос, в котором просто перечислено несколько задач из задачника. Отвечать на такие вопросы неудобно, ответы трудно читаются в выпусках рассылок, затрудняется обсуждение в форуме. Поэтому большинство экспертов просто игнорируют вопросы, в которых под видом одного дано несколько вопросов или задач. Гораздо лучше, если Вы в одном вопросе спросите про решение одной проблемы, особенно, если Вы покажете, что пытались решить ее самостоятельно, и укажете, что именно вызвало трудности. Тогда многие захотят Вам помочь.
Удачи!
Об авторе:
Устав – есть устав! Если ты устав – то отдыхай!
1)Абсолютно чёрное тело находится при температуре 2100 К. В результате остывания длина волны, соответствующая максимуму испускательной способности, изменилась на 9 мкм. До какой температуры охладилось тело?
Из первого закона Вина следует, что длина длины волны, соответствующей максимуму испускательной способности (максимуму спектральной плотности энергетической светимости) абсолютно чёрного тела, имеющего термодинамическую температуру равна
где м*К -- постоянная Вина.
Вы можете воспользоваться теперь решением задачи, которое есть в Интернете. Оно показано в прикреплённом файле. Результат таков:
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mr.mad5 
длины волны, соответствующей максимуму испускательной способности (максимуму спектральной плотности энергетической светимости) абсолютно чёрного тела, имеющего термодинамическую температуру 
равна
м*К -- постоянная Вина.
(К) -- температура, до которой охладилось тело.
