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Консультация № 138141
27.05.2008, 18:09
0.00 руб.
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Между двумя плоскопараллельными стеклянными пластинками положили очень тонкую проволочку. Проволочка находится на растоянии 75 мм от линии соприкосновения пластинок и ей параллельна. В отраженном свете при длине волны 0,5 мкм на верхней пластинке видны интерференционные полосы. Определить толщину проволочки, если на протяжении 30 мм насчитывается 16 световых полос.
Помогите, пожалуйста...
Помогите, пожалуйста...
Обсуждение
31.05.2008, 04:00
общий
это ответ
Здравствуйте, Korablestroitel!
Писать формулы надоело, попробую так объяснить. 16 световых полос - это 16 длин волн. Столько их насчитывается на протяжении 30 мм; значит, на протяжении 75 мм их насчитается (75/30)*16 = 40 (в молчаливом предположении, что пластинки абсолютно плоские - но других данных у нас нет). Длина одной волны 0.5 мкм, а сорока волн - 40*0.5 = 20 мкм. Это и есть фактическое расстояние между стеклянными пластинками там, где положили очень тонкую проволочку, или, что то же самое, толщина проволочки - 20 мкм или 0.02 мм. (Если для понимания нуждаетесь в пояснительном рисунке, сообщите на мини-форуме).
Писать формулы надоело, попробую так объяснить. 16 световых полос - это 16 длин волн. Столько их насчитывается на протяжении 30 мм; значит, на протяжении 75 мм их насчитается (75/30)*16 = 40 (в молчаливом предположении, что пластинки абсолютно плоские - но других данных у нас нет). Длина одной волны 0.5 мкм, а сорока волн - 40*0.5 = 20 мкм. Это и есть фактическое расстояние между стеклянными пластинками там, где положили очень тонкую проволочку, или, что то же самое, толщина проволочки - 20 мкм или 0.02 мм. (Если для понимания нуждаетесь в пояснительном рисунке, сообщите на мини-форуме).
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