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Консультация № 189057
01.04.2016, 08:51
0.00 руб.
01.04.2016, 17:18
0
1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Межплоскостное расстояние в кристалле марганца равно 2,4[$183$]10-10 м. Определить, при какой длине волны рентгеновских лучей первый максимум при отражении будет наблюдаться под углом 15[$176$]. Найти минимальное напряжение на рентгеновской трубке.
Спасибо заранее)
Межплоскостное расстояние в кристалле марганца равно 2,4[$183$]10-10 м. Определить, при какой длине волны рентгеновских лучей первый максимум при отражении будет наблюдаться под углом 15[$176$]. Найти минимальное напряжение на рентгеновской трубке.
Спасибо заранее)
Обсуждение
01.04.2016, 17:53
общий
это ответ
Здравствуйте, Katerina!
Примем, что в условии имеется ввиду обычно используемый в кристаллографии угол отклонения луча 2[$629$]=15[$176$]
Разность хода лучей, отражённых от двух ближайших плоскостей (с межплоскостным расстоянием d)
n[$955$]=2d[$183$]sin(2[$629$]/2)
[$955$]=2d/n[$183$]sin(2[$629$]/2)=6,27[$183$]10-11 м
Энергия такого фотона
E=hc/[$955$]=3,17[$183$]10-15 Дж
Чтобы получить такое излучение, нужно придать электронам кинетическую энергию не меньше данной величины. Для этого нужна разность потенциалов
U=E/e=hc/[$955$]e=1,98[$183$]104 В [$8776$] 20 кВ
Если в условии имеется ввиду [$629$]=15[$176$], то
[$955$]=2d/n[$183$]sin[$629$]=1,24[$183$]10-10 м
U=hc/[$955$]e=1,0[$183$]104 В = 10 кВ
Примем, что в условии имеется ввиду обычно используемый в кристаллографии угол отклонения луча 2[$629$]=15[$176$]
Разность хода лучей, отражённых от двух ближайших плоскостей (с межплоскостным расстоянием d)
n[$955$]=2d[$183$]sin(2[$629$]/2)
[$955$]=2d/n[$183$]sin(2[$629$]/2)=6,27[$183$]10-11 м
Энергия такого фотона
E=hc/[$955$]=3,17[$183$]10-15 Дж
Чтобы получить такое излучение, нужно придать электронам кинетическую энергию не меньше данной величины. Для этого нужна разность потенциалов
U=E/e=hc/[$955$]e=1,98[$183$]104 В [$8776$] 20 кВ
Если в условии имеется ввиду [$629$]=15[$176$], то
[$955$]=2d/n[$183$]sin[$629$]=1,24[$183$]10-10 м
U=hc/[$955$]e=1,0[$183$]104 В = 10 кВ
5
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