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Консультация № 176785
20.02.2010, 04:46
0.00 руб.
0
3
1
На плоскую пластину направлен монохроматический пучок света. Фототок прекращается при задерживающей раности потенциалов U=1.5В. Определить длину волны [$955$] света, падающего на пластину.
Обсуждение
20.02.2010, 08:42
общий
ИМХО: не хватает данных (материала пластины или работы выхода)
Об авторе:
С уважением
shvetski
С уважением
shvetski
20.02.2010, 11:51
общий
это ответ
Здравствуйте, Lybares.
Работа электрического поля по торможению электронов равна их максимальной кинетической энергии
e*U=E (1)
Из уравнения Эйнштейна для фотоэффекта
h*v= A+E (2)
где v - частота световой волны, h=6.63*10-34 Дж*с - постоянная Планка, А - работа выхода электронов (ищем в справвочниках: для цинка А=4,24 эВ = 6,78*10-19 Дж
v=c/[$955$] (3)
c=3*108 м/с - скорость света, [$955$] - длина световой волны.
Решая систему уравнений 1,2,3
получаем выражение для [$955$]
[$955$]= h*c/(А+e*U)
после подстановки и расчетов
[$955$]~2.2*10-7 м
Удачи
Работа электрического поля по торможению электронов равна их максимальной кинетической энергии
e*U=E (1)
Из уравнения Эйнштейна для фотоэффекта
h*v= A+E (2)
где v - частота световой волны, h=6.63*10-34 Дж*с - постоянная Планка, А - работа выхода электронов (ищем в справвочниках: для цинка А=4,24 эВ = 6,78*10-19 Дж
v=c/[$955$] (3)
c=3*108 м/с - скорость света, [$955$] - длина световой волны.
Решая систему уравнений 1,2,3
получаем выражение для [$955$]
[$955$]= h*c/(А+e*U)
после подстановки и расчетов
[$955$]~2.2*10-7 м
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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