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Консультация № 160275
12.02.2009, 10:56
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Здравствуйте! Помогите решить задачу ничего в этом не понимаю
55. Определить пороговую энергию образования электронно-позитронной пары в кулоновском поле электрона, которая происходит по схеме y+ e– -----> e– + e+ + e–
56. Определить максимальную кинетическую энергию электрона, испускаемого при распаде нейтрона. Написать схему распада.
55. Определить пороговую энергию образования электронно-позитронной пары в кулоновском поле электрона, которая происходит по схеме y+ e– -----> e– + e+ + e–
56. Определить максимальную кинетическую энергию электрона, испускаемого при распаде нейтрона. Написать схему распада.
Обсуждение
Неизвестный
12.02.2009, 17:10
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это ответ
Здравствуйте, Irina03!
Решение:
56. Электрон возникает в результате ядерной реакции:
Нейтрон -> Протон + Электрон + Антинейтрино
01n --> 11p + -10e + ν.
Антинейтрино не имеет ни массы покоя, ни заряда.
Найдем дефект масс этой реакции, который определяется соотношением:
Δm = ∑Mi + ∑Mj , где Mi – массы частиц, вступающих в ядерную реакцию; Mj – массы частиц, получившихся в результате реакции.
Итак, имеем: Δm = М 01n - М 11p – М -10e . (1)
Из таблицы "Массы некоторых элементарных частиц и атомов" найдем:
М 01n = 1,00866501 а.е.м.:
М 11p = 1,00727647 а.е.м.;
М -10e = 0, 00054858 а.е.м.
Эти значения масс подставим в (1):
Δm =1,00866501 – 1,00727647 – 0,00054858 = 0,00083996 (а.е.м.)
Так как дефект масс положителен, то выделяется следующая энергия:
ΔЕ = Δm*931(МэВ) = 0,00083996*931 = 0,782(МэВ).
1МэВ = 1,6*10^-13 Дж.
Отсюда: ΔЕ = 1,25*10^-13 Дж.
Решение:
56. Электрон возникает в результате ядерной реакции:
Нейтрон -> Протон + Электрон + Антинейтрино
01n --> 11p + -10e + ν.
Антинейтрино не имеет ни массы покоя, ни заряда.
Найдем дефект масс этой реакции, который определяется соотношением:
Δm = ∑Mi + ∑Mj , где Mi – массы частиц, вступающих в ядерную реакцию; Mj – массы частиц, получившихся в результате реакции.
Итак, имеем: Δm = М 01n - М 11p – М -10e . (1)
Из таблицы "Массы некоторых элементарных частиц и атомов" найдем:
М 01n = 1,00866501 а.е.м.:
М 11p = 1,00727647 а.е.м.;
М -10e = 0, 00054858 а.е.м.
Эти значения масс подставим в (1):
Δm =1,00866501 – 1,00727647 – 0,00054858 = 0,00083996 (а.е.м.)
Так как дефект масс положителен, то выделяется следующая энергия:
ΔЕ = Δm*931(МэВ) = 0,00083996*931 = 0,782(МэВ).
1МэВ = 1,6*10^-13 Дж.
Отсюда: ΔЕ = 1,25*10^-13 Дж.
Форма ответа
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