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Задать вопрос экспертам

Консультация № 203010

20.06.2022, 21:22

0.00 руб.

0 1 1

Образование

Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Выбиваемые светом при фотоэффекте электроны при облучении фотокатода
видимым светом полностью задерживаются обратным напряжением 1,2 В.
Специальные измерения показали, что длина волны падающего света 400 нм.
Определите красную границу фотоэффекта (в нм) и работу выхода (в эВ)
электронов из этого металла.

Обсуждение

давно

Посетитель
226425
1567

21.06.2022, 00:59

общий

это ответ

Дано:
U_З=1,2В
[$955$]=4*10^-7м
Найти: [$955$]₀, А_ВЫХ
Решение:
1. Энергия падающего фотона
[$949$]=hc/[$955$]=6,63*10^-34*3*10⁸/4*10^-7=5,0*10^-19Дж=3,1 эВ
2. Максимальная кинетическая энергия фотоэлектронов
E_{к max}=e*U_З=1,6*10^-19*1,2=1,9*10^-19Дж=1,2 эВ
3. Уравнение Эйнштейна для внешнего фотоэффекта
[$949$]=A_ВЫХ+Е_{k max}
Отсюда
A[sub]ВЫХ[/sub]=[$949$]-Е_{k max}=3,1-1,2=1,9 эВ=3,0*10^-19Дж
4. А_ВЫХ=hc/[$955$]₀
Следовательно
[$955$][sub]0[/sub]=hc/A_ВЫХ=6,63*10^-34*3*10⁸/3*10^-19=6,6*10[sup]-7[/sup]м (660 нм)

Об авторе:
С уважением
shvetski

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