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Консультация № 200480
24.03.2021, 07:24
0.00 руб.
0
2
2
Здравствуйте! Прошу помощи в следующем вопросе:
Определить максимальную скорость фотоэлектронов,вылетающих из вольфрамового электрода,освещаемого ультрафиолетовым светом с длиной волны 0,2 мкм
Если можно с подробным решением.
Определить максимальную скорость фотоэлектронов,вылетающих из вольфрамового электрода,освещаемого ультрафиолетовым светом с длиной волны 0,2 мкм
Если можно с подробным решением.
Обсуждение
24.03.2021, 11:13
общий
это ответ
Здравствуйте, naduha21794!
Дано:
мкм
м
эВ
Дж
Решение:
по уравнению Эйнштейна для фотоэффекта:
Длина волны падающего света:
Тогда частота падающего света:
(м/с)
(км/с)
Ответ:
км/с
Дано:
мкмм эВДжРешение:
по уравнению Эйнштейна для фотоэффекта:
Длина волны падающего света:
Тогда частота падающего света:
(м/с)(км/с)Ответ:
км/с
5
24.03.2021, 11:16
общий
это ответ
Здравствуйте, naduha21794!
Дано:
(W)
[$955$]=2*10-7м
Найти: Vmax
Решение:
Нам понадобятся три простых формулы:
1) энергия фотона
ef=h*[$957$]=h*c/[$955$] (1)
2) уравнение Эйнштейна для внешнего фотоэффекта
ef=A+Ek max (2)
3) максимальная кинетическая энергия фотоэлектронов
Ek max=(1/2)m*Vmax2 (3)
Значения констант определим по справочникам:
h=6,63*10-34 Дж*с - постоянная Планка;
c=3*108 м/с - скорость света в вакууме;
m=9,1*10-31 кг - масса электрона;
и работа выхода электрона из вольфрама
A=7,2*10-19 Дж
Итак
- из формулы (1)
ef[$8776$]9,9*10-19 Дж;
- из формулы (2)
Ek max=ef-A = 2,7*10-19 Дж;
- из формулы (3)
Vmax=[$8730$](2Ek max/m) = 7,7*105 м/с
Удачи
Дано:
(W)
[$955$]=2*10-7м
Найти: Vmax
Решение:
Нам понадобятся три простых формулы:
1) энергия фотона
ef=h*[$957$]=h*c/[$955$] (1)
2) уравнение Эйнштейна для внешнего фотоэффекта
ef=A+Ek max (2)
3) максимальная кинетическая энергия фотоэлектронов
Ek max=(1/2)m*Vmax2 (3)
Значения констант определим по справочникам:
h=6,63*10-34 Дж*с - постоянная Планка;
c=3*108 м/с - скорость света в вакууме;
m=9,1*10-31 кг - масса электрона;
и работа выхода электрона из вольфрама
A=7,2*10-19 Дж
Итак
- из формулы (1)
ef[$8776$]9,9*10-19 Дж;
- из формулы (2)
Ek max=ef-A = 2,7*10-19 Дж;
- из формулы (3)
Vmax=[$8730$](2Ek max/m) = 7,7*105 м/с
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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