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Консультация № 173388
18.10.2009, 15:16
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Здравствуйте Уважаемые эксперты! Помогите пожалуйста с задачками, очень надо:
1.Среднее время жизни dt атома в возбужденном состоянии составляет около 10-8 с. При переходе атома в нормальное состояние испускается фотон, средняя длина волны которого равна 400 нм. Оценить относительную ширину dL/L излучаемой спектральной линии, если не происходит уширение линии за счет других процессов.
2.Вычислить (по Дебаю) удельную теплоемкость хлористого натрия три температуре Условие считать выполненным.
3.Прямое напряжение, приложенное к р-п-переходу, равно 2 В. Во сколько раз возрастет сила тока через переход, если изменить температуру от Т1 = 300 К до Т2 = 273 К?
Заранее спасибо
1.Среднее время жизни dt атома в возбужденном состоянии составляет около 10-8 с. При переходе атома в нормальное состояние испускается фотон, средняя длина волны которого равна 400 нм. Оценить относительную ширину dL/L излучаемой спектральной линии, если не происходит уширение линии за счет других процессов.
2.Вычислить (по Дебаю) удельную теплоемкость хлористого натрия три температуре Условие считать выполненным.
3.Прямое напряжение, приложенное к р-п-переходу, равно 2 В. Во сколько раз возрастет сила тока через переход, если изменить температуру от Т1 = 300 К до Т2 = 273 К?
Заранее спасибо
Обсуждение
19.10.2009, 00:15
общий
По поводу первой задачи (см. вопрос 173216)
∆W ≥ h/(2πτ)
h∆ν ≥ h/(2πτ)
∆ν ≥ 1/(2πτ)
Δλ=|dλ/dv|*∆ν=c/v2*∆ν=[$955$]2*∆ν/с=[$955$]2/(2πτс)
Δλ/λ=λ/(2πτс)
Примечание: полученное значение является отклонением от среднего значения, то есть ширина полосы (т.к. отклонения происходят в обе стороны) в 2 раза больше
∆W ≥ h/(2πτ)
h∆ν ≥ h/(2πτ)
∆ν ≥ 1/(2πτ)
Δλ=|dλ/dv|*∆ν=c/v2*∆ν=[$955$]2*∆ν/с=[$955$]2/(2πτс)
Δλ/λ=λ/(2πτс)
Примечание: полученное значение является отклонением от среднего значения, то есть ширина полосы (т.к. отклонения происходят в обе стороны) в 2 раза больше
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