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Консультация № 199888
15.12.2020, 09:56
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
На поверхность металла падают монохроматические лучи с длиной волны 150 нм. Красная граница фотоэффекта lк = 200 нм. Какая доля энергии фотона расходуется на сообщение электрону кинетической энергии?
На поверхность металла падают монохроматические лучи с длиной волны 150 нм. Красная граница фотоэффекта lк = 200 нм. Какая доля энергии фотона расходуется на сообщение электрону кинетической энергии?
Обсуждение
21.12.2020, 07:52
общий
это ответ
Здравствуйте, ira.medvedeva00!
В соответствии с уравнением Эйнштейна для внешнего фотоэффекта, для излучения с частотой [$957$]
где A - работа выхода фотоэлектрона, [$957$][sub]k[/sub] - частота красной границы фотоэффекта. С учётом того, что [$957$] = c/[$955$] и [$957$][sub]k[/sub] = c/[$955$][sub]k[/sub], уравнение примет вид
откуда доля работы выхода в энергии фотона составит [$955$]/[$955$][sub]k[/sub], а на долю кинетической энергии придётся 1-[$955$]/[$955$][sub]k[/sub], что при [$955$] = 150 нм и [$955$][sub]k[/sub] = 200 нм равняется 1-150/200 = 1/4.
В соответствии с уравнением Эйнштейна для внешнего фотоэффекта, для излучения с частотой [$957$]
где A - работа выхода фотоэлектрона, [$957$][sub]k[/sub] - частота красной границы фотоэффекта. С учётом того, что [$957$] = c/[$955$] и [$957$][sub]k[/sub] = c/[$955$][sub]k[/sub], уравнение примет вид
откуда доля работы выхода в энергии фотона составит [$955$]/[$955$][sub]k[/sub], а на долю кинетической энергии придётся 1-[$955$]/[$955$][sub]k[/sub], что при [$955$] = 150 нм и [$955$][sub]k[/sub] = 200 нм равняется 1-150/200 = 1/4.
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