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Консультация № 201360
25.08.2021, 20:49
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25.08.2021, 22:12
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Здравствуйте, mari_nikopol!
Рассмотрим следующее задание: "При наблюдении явления фотоэффекта использовался монохроматический свет с частотой выше красной границы. Интенсивность света увеличили. Как изменился импульс фотонов? Как изменился суммарный импульс фотонов? Как изменилась скорость вылета фотоэлектронов? Как изменился фототок насыщения?"
Красная граница фотоэффекта соответствует наименьшей частоте света, падающего на поверхность вещества, при которой внешний фотоэффект (вырывание электронов из вещества) ещё возможен. Если свет является монохроматическим, то все фотоны имеют одинаковую энергию и одинаковый импульс. Но число фотоэлектронов, вырываемых за 1 секунду с поверхности вещества, пропорционально интенсивности падающего света, ввиду увеличения числа падающих фотонов. Поэтому при увеличении интенсивности света импульс фотонов не изменится, их суммарный импульс увеличится. Сила фототока насыщения прямо пропорциональна интенсивности падающего света, поэтому величина фототока насыщения увеличится.
Кинетическая энергия фотоэлектронов не зависит от интенсивности падающего света, а зависит линейно от его частоты. Поэтому скорость вылета фотоэлектронов не изменится.
Рассмотрим следующее задание: "При наблюдении явления фотоэффекта использовался монохроматический свет с частотой выше красной границы. Интенсивность света увеличили. Как изменился импульс фотонов? Как изменился суммарный импульс фотонов? Как изменилась скорость вылета фотоэлектронов? Как изменился фототок насыщения?"
Красная граница фотоэффекта соответствует наименьшей частоте света, падающего на поверхность вещества, при которой внешний фотоэффект (вырывание электронов из вещества) ещё возможен. Если свет является монохроматическим, то все фотоны имеют одинаковую энергию и одинаковый импульс. Но число фотоэлектронов, вырываемых за 1 секунду с поверхности вещества, пропорционально интенсивности падающего света, ввиду увеличения числа падающих фотонов. Поэтому при увеличении интенсивности света импульс фотонов не изменится, их суммарный импульс увеличится. Сила фототока насыщения прямо пропорциональна интенсивности падающего света, поэтому величина фототока насыщения увеличится.
Кинетическая энергия фотоэлектронов не зависит от интенсивности падающего света, а зависит линейно от его частоты. Поэтому скорость вылета фотоэлектронов не изменится.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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