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Консультация № 177473
25.03.2010, 22:31
0.00 руб.
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Здравствуйте уважаемые эксперты! Помогите решить задачи:
1)Расстояние между штрихами дифракционной решетки d =4 мкм. На решетку падает нормально свет с длиной волны лямбда = 0,58 мкм. Максимум какого наибольшего порядка mmax дает эта решетка?
2)На металл падает рентгеновское излучение с длиной волны лямбда= 1 нм. Пренебрегая работой выхода, определить максимальную скорость Vmax фотоэлектронов.
1)Расстояние между штрихами дифракционной решетки d =4 мкм. На решетку падает нормально свет с длиной волны лямбда = 0,58 мкм. Максимум какого наибольшего порядка mmax дает эта решетка?
2)На металл падает рентгеновское излучение с длиной волны лямбда= 1 нм. Пренебрегая работой выхода, определить максимальную скорость Vmax фотоэлектронов.
Обсуждение
26.03.2010, 11:16
общий
это ответ
Здравствуйте, abramova_89.
Решение 2 задачи:
Запишем закон фотоэффекта hv=A+V(max)
Если рассматривать задачу пренебрегая работой выхода получим - hv=V(max)
v=c/лямбда
Получаем: V(max)=h*c/лямбда
Вычислим: V(max)=6,57*10^-34*3*10^8/(1*10^-9)=1,97*10^-16(м/с)
Решение 2 задачи:
Запишем закон фотоэффекта hv=A+V(max)
Если рассматривать задачу пренебрегая работой выхода получим - hv=V(max)
v=c/лямбда
Получаем: V(max)=h*c/лямбда
Вычислим: V(max)=6,57*10^-34*3*10^8/(1*10^-9)=1,97*10^-16(м/с)
26.03.2010, 15:52
общий
это ответ
Здравствуйте, abramova_89.
Если пренебречь работой выхода, то
h*c/[$955$] = EK max
(что буквально означает, что вся энергия фотона идет на сообщение электрону кинетической энергии),
а никак не Vmax,
как пишет уважаемый предыдущий автор ВИТАКИСС,
тогда
h*c/[$955$] = m*v2max/2
Отсюда
vmax=[$8730$](2*h*c/([$955$]*m))
Надеюсь, у вас получится правильно подставить значения величин и рассчитать.
Если что, пишите
Удачи
Если пренебречь работой выхода, то
h*c/[$955$] = EK max
(что буквально означает, что вся энергия фотона идет на сообщение электрону кинетической энергии),
а никак не Vmax,
как пишет уважаемый предыдущий автор ВИТАКИСС,
тогда
h*c/[$955$] = m*v2max/2
Отсюда
vmax=[$8730$](2*h*c/([$955$]*m))
Надеюсь, у вас получится правильно подставить значения величин и рассчитать.
Если что, пишите
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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