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Консультация № 195374
24.04.2019, 18:40
0.00 руб.
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Здравствуйте! Прошу помощи в следующем вопросе:
На поверхность металла падает монохроматический свет. Чтобы прекратить эмиссию электронов, нужно приложить задерживающую разность потенциалов 3 В. Определить длину волны падающего излучения λ, если работа выхода А = 2,2 эВ.
На поверхность металла падает монохроматический свет. Чтобы прекратить эмиссию электронов, нужно приложить задерживающую разность потенциалов 3 В. Определить длину волны падающего излучения λ, если работа выхода А = 2,2 эВ.
Обсуждение
27.04.2019, 10:05
общий
это ответ
Здравствуйте, nikitaknyshov134554!
При прекращении эмисси вся энергия h c/[$955$], которую получает электрон, расходуется на работу выхода
и преодоление задерживающей разности потенциалов, то есть,
h c/[$955$] = 2.2 эВ + 3 эВ = 5.2 эВ.
Для вычисления [$955$] удобно воспользоваться приближенным значением h c/(2 pi) = 200 эВ*нм.
Подставляя, найдем:
[$955$] = 200*2*3.14/5.2 = 240 нм.
При прекращении эмисси вся энергия h c/[$955$], которую получает электрон, расходуется на работу выхода
и преодоление задерживающей разности потенциалов, то есть,
h c/[$955$] = 2.2 эВ + 3 эВ = 5.2 эВ.
Для вычисления [$955$] удобно воспользоваться приближенным значением h c/(2 pi) = 200 эВ*нм.
Подставляя, найдем:
[$955$] = 200*2*3.14/5.2 = 240 нм.
27.04.2019, 13:34
общий
это ответ
Здравствуйте, nikitaknyshov134554!
Согласно уравнению Эйнштейна для внешнего фотоэффекта, имеем
откуда
где
-- длина волны падающего излучения, 
Дж*с -- постоянная Планка, 
м/с -- скорость распространения электромагнитных волн в вакууме, 
-- работа выхода, 
Кл -- заряд электрона, 
-- задерживающая разность потенциалов. В Вашем случае 
эВ
Дж, 
В. Тогда
(м)
(нм).
Отправляя своё решение вслед за уже полученным Вами, я исходил из того, что неспециалисту в атомной физике значения постоянных, выраженные не в единицах СИ, неизвестны. Поэтому расчёт выполнил в единицах СИ.
Согласно уравнению Эйнштейна для внешнего фотоэффекта, имеем
откуда
где
-- длина волны падающего излучения, Дж*с -- постоянная Планка, м/с -- скорость распространения электромагнитных волн в вакууме, -- работа выхода, Кл -- заряд электрона, -- задерживающая разность потенциалов. В Вашем случае эВ Дж, В. Тогда (м) (нм).Отправляя своё решение вслед за уже полученным Вами, я исходил из того, что неспециалисту в атомной физике значения постоянных, выраженные не в единицах СИ, неизвестны. Поэтому расчёт выполнил в единицах СИ.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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