File:46. Зрачење на апсолутно црно тело.ogv
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Description46. Зрачење на апсолутно црно тело.ogv |
English: Stefan-Boltzmann law describes the relation between total energy radiated per unit surface area per unit time and temperature. But, in this law Stefan-Boltzmann constant appears as constant of proportionality. Yet, the radiated energy depends on the characteristics of the body surface. In this experiment, two grey bodies are presented, on closer to black body and other closer to white body. The change in the temperature shows that the body which is closer to black body cools down faster then the white body. One can conclude that the first body radiates more energy per unit time then the white body. Prepared, performed and explained by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, Macedonia.
Français : Démonstration de principes de thermodynamique à l'aide de deux corps gris, dont l'un est plus près du corps noir (canette brune) que l'autre (canette au revêtement d'aluminium). Il s'ensuit que la canette brune perd plus rapidement sa chaleur que l'autre.
Expérience réalisée et expliquée par le professeur Oliver Zajkov de l'Institut de physique de l'université Saints-Cyrille-et-Méthode de Skopje de Macédoine. Македонски: Штефан-Болцмановиот закон за зрачење на апсолутно црно тело ја дава зависноста на вкупната енергија која е емитирана од идеално црно тело од единица површина и во единица време (вкупната емисивност) од температурата на телото. Но, во законот се појавува и Штефан-Болцмановата константа. Сепак, емисивноста на едно реално тело зависи и од карактеристиките на неговата површина. Во тој случај, веќе не станува збор за апсолутно црно тело и Штефан-Болцмановата константа веќе не важи. Во експериментот се дадени две сиви тела. Едното кое е поблиску до апсолутно црно тело и другото поблиску до бело тело. Мерењето на температурата покажува дека телото кое е поблиску до апсолутно црно тело се лади побргу од другото тело. Оттука може да се заклучи дека тоа тело емитира повеќе енергија во единица време отколку "белото" тело. Подготвено, изведено и објаснето од проф. Оливер Зајков на Институтот за физика на Природно-математичкиот факултет во Скопје. |
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Source | Own work |
Author | Карас Студио |
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current | 11:59, 2 February 2021 | 2 min 35 s, 1,920 × 1,080 (68.28 MB) | Dandarmkd (talk | contribs) | Uploaded own work with UploadWizard |
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