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Консультация № 198320

21.04.2020, 12:18

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Образование

Здравствуйте! Прошу помощи в следующем вопросе:
Чтобы изменить в два раза задерживающую разность потенциалов для фотодиода с катодом из цинка (работа выхода равна 4 эВ), нужно в 1,5 раза увеличить частоту падающего на катод света. Определить первоначальную частоту света.

Обсуждение

давно

Roman Chaplinsky / Химик CH

Модератор
156417
2175

22.04.2020, 14:52

общий

это ответ

Здравствуйте, chelsea10barca11!

Задерживающая разность потенциалов U связана с работой выхода W и энергией фотона h[$957$] следущим образом:
eU=h[$957$]-W
Согласно условию, увеличение частоты [$957$] в 1,5 раза приводит к удвоению разности потенциалов
2eU=1,5h[$957$]-W
Откуда
2h[$957$]-2W=1,5h[$957$]-W
0,5h[$957$]=W
h[$957$]=2W=8 эВ
[$957$]=8эВ/h=8эВ/(4,136[$183$]10^-15эВ[$183$]с)=1,93[$183$]10¹⁵ Гц

5

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