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Как и во сколько раз изменится поток излучения абсолютно черного тела, если максимум энергии излучения переместится с красной границы видимого спектра ( 780 нм) на фиолетовую ( 390 нм)?
Обсуждение
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12.02.2009, 21:13
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12.02.2009, 22:05
это ответ
Здравствуйте, Мария Романова! Решение: Такая задача один к одному рассматривалась в рассылке "Физика". См. Вопрос №126471 Ответ дал эксперт Gerhard.
Приложение: 1) Формула для эффекта Комптона, определяющая изменение длины волны delthalamda фотона после его соударения с электроном выглядит следующим образом: delhalamda=h*(1-cos(tetta))/(me*c) (1) где h=6,62*10^-34 Дж*с - постоянная Планка, me=9,11*10^-31 кг - масса электрона, с=3*10^8 м/с - скорость света, tetta=pi/2 - угол рассеяния; энергия фотона E связана с его длиной волны lamda как E=h*c/lamda (2); С учетом (1) и (2) изменение энергии электрона равна: delthaE=me*c^2/(1-cos(tetta)) (3) Поскольку удар фотона с электроном - абсолютно упругий, выполняется закон сохранения энергии и энергия, потерянная фотоном переходит в энергию электрона отдачи Ee: Ee=delthaE (4) Чтобы найти долю энергии k фотона, приходящуюся на Ee, найдем их отношение: k=Ee/ε1, с учетом (4): k=delthaE/ε1(5) где ε1=1,51 МэВ - энергия фотона до соударения; решая (5) совместно с (3) получаем: k=me*c^2/((1-cos(tetta))*ε1)=(9,11*10^-31*(3*10^8)^2/((1-cos(pi/2))*(1,51*10^6*1,6*10^-19))=0,34
2) Согласно закону Стефана-Больцмана поток излучения пропорционален четвертой степени температуры тела: R=sigma*T^4 (1) где sigma - коэффициент Стефана-Больцмана; тогда для двух разных температур T1 и Т2 можно записать: R2/R1=(T2/T1)^4 (2) В то же время по закону Вина температура тела связана с длиной волны lambdam, соответстувующей максимуму энергии излучения как: lambdam=b/T (3) где b - постоянная Вина; тогда для двух разных температур T1 и Т2 можно записать: T2/T1=(lambdam1/lambdam2) (4) Решая систему из (2) и (4) получаем: R2/R1=(lambdam1/lambdam2)^4=(780/390)^4=16 - поток увеличится в 16 раз
3) Условие максимума дифракционной решетки выглядит как: d*sin(fi)=m*lambda (1) где d - постоянная решетки, m - порядок спектра, для первого максимума равен единице, lambda - длина волны света; fi - угол отклонения дифрагированного луча от его первоначального направления; в силу симметрии максимумов очевидно, что искомый угол а=2*fi; по условию задачи постоянная решетки и длина волны связаны соотношением: d=4*lambda (2) Подставляя (2) в (1) и учитывая, что m=1 выражаем sin(fi): sin(fi)=1/4 -> a=2*arcsin(1/4)=14,48 град Ответил: Gerhard, Практикант Дата отправки: 09.03.2008, 10:52
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