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Консультация № 177102
07.03.2010, 00:01
0.00 руб.
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1
1
Здравствуйте уважаемые эксперты, помогите пожалуйста решить ( нужно только сделать рисунок) задачу:
Фотон с энергией E = 10 эВ падает на серебряную пластину и вызывает фотоэффект. Определить импульс р, полученный пластиной, если принять, что направление движения фотона и фотоэлектрона лежат на одной прямой, перпендикулярной поверхности пластины.
Фотон с энергией E = 10 эВ падает на серебряную пластину и вызывает фотоэффект. Определить импульс р, полученный пластиной, если принять, что направление движения фотона и фотоэлектрона лежат на одной прямой, перпендикулярной поверхности пластины.
Обсуждение
07.03.2010, 11:48
общий
это ответ
Здравствуйте, Чаркин Иван Александрович.
Дано:
Ef=10 эВ = 1,6*10-18 Дж
Работа выхода электрона из серебра А = 4,3 эВ = 6,9*10-19 Дж
Масса электрона me=9.1*10-31 кг
Скорость света c=3*108 м/с
найти: p
Решение:
Пластина получает импульс от падающего фотона (р1) и импульс отдачи от электрона (р2)
р=р1+р2
Импульс фотона
p1=Ef/c = 5*10-27 кг*м/с
Импульс электрона
р2=ЕК/v (1)
Кинетическая энергия электрона
EK=Ef-A = 5.7 эВ = 9,1*10-19 Дж
Скоростьэлектрона
v=[$8730$](2*EK/me) = 1.4*106 м/с
Тогда, по формуле (1)
р2=6,5*10-25 кг*м/с
Импульс отдачи электрона примерно в 100 раз больше импульса поглощения фотона, поэтому можно считать, что
p~p2=6,5*10-25 кг*м/с
Дано:
Ef=10 эВ = 1,6*10-18 Дж
Работа выхода электрона из серебра А = 4,3 эВ = 6,9*10-19 Дж
Масса электрона me=9.1*10-31 кг
Скорость света c=3*108 м/с
найти: p
Решение:
Пластина получает импульс от падающего фотона (р1) и импульс отдачи от электрона (р2)
р=р1+р2
Импульс фотона
p1=Ef/c = 5*10-27 кг*м/с
Импульс электрона
р2=ЕК/v (1)
Кинетическая энергия электрона
EK=Ef-A = 5.7 эВ = 9,1*10-19 Дж
Скоростьэлектрона
v=[$8730$](2*EK/me) = 1.4*106 м/с
Тогда, по формуле (1)
р2=6,5*10-25 кг*м/с
Импульс отдачи электрона примерно в 100 раз больше импульса поглощения фотона, поэтому можно считать, что
p~p2=6,5*10-25 кг*м/с
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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