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Консультация № 196204
26.08.2019, 22:35
0.00 руб.
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1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
При облучении металла с работой выхода А светом, имеющим частоту ν и длину волны λ, наблюдается фотоэффект. Красная граница фотоэффекта 𝜆кр, кинетическая энергия фотоэлектронов Т, максимальная скорость вырванных фотоэлектронов υ. Работа выхода электронов из металла Aвых.
Авых = 1,8 эВ
v = 2 Мм/с
Найти
λ = ?
λкр = ?
Т = ?
При облучении металла с работой выхода А светом, имеющим частоту ν и длину волны λ, наблюдается фотоэффект. Красная граница фотоэффекта 𝜆кр, кинетическая энергия фотоэлектронов Т, максимальная скорость вырванных фотоэлектронов υ. Работа выхода электронов из металла Aвых.
Авых = 1,8 эВ
v = 2 Мм/с
Найти
λ = ?
λкр = ?
Т = ?
Обсуждение
28.08.2019, 22:30
общий
это ответ
Здравствуйте, dar777!
Теория, знание которой необходимо для решения Вашей задачи, изложена, в частности, на страницах 556 -- 561, 569 [1] (Вы можете загрузить эту книгу здесь; Вам полезно будет прочитать её, если Вы заинтересовались решением задач школьного уровня по квантовой физике). В соответствии с указанными там формулами,
Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Теория, знание которой необходимо для решения Вашей задачи, изложена, в частности, на страницах 556 -- 561, 569 [1] (Вы можете загрузить эту книгу здесь; Вам полезно будет прочитать её, если Вы заинтересовались решением задач школьного уровня по квантовой физике). В соответствии с указанными там формулами,
[$955$]кр=hc/Aвых[$8776$]6,62*10-34*3,00*108/(1,80*1,60*10-19)[$8776$]6,90*10-7 (м)=690 нм;
T=mv2/2=9,11*10-31*(2*106)2/2[$8776$]1,82*10-18 (Дж);
[$955$]=hc/(Aвых+T)[$8776$]6,62*10-34*3,00*108/(1,80*1,60*10-19+1,82*10-18)[$8776$]9,42*10-8 (м)=94,2 нм.
Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
Форма ответа
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