Предмет: Физика, автор: agattaaaa

рассчитайте светимость звёзды Альтаир,если её радиус 1,2 млн.км.Температура поверхности 8000К.
помогите срочно ​

Ответы

Автор ответа: mathkot
0

Ответ:

Светимость звезды Альтаир приблизительно 42 025 739,4 · 10²⁰ Вт

Объяснение:

Дано:

R = 1,2 · 10⁶ км = 12 · 10⁸ м

T = 8000 K = 8 · 10³ K

\sigma = 5,67 · 10⁻⁸ Вт · м⁻² · K⁻⁴

Найти:

L \ - \ ?

------------------------------------------------

Решение:

Светимость звезды:

\boldsymbol{\boxed{L = 4\pi R^{2} \sigma T^{4}}}

Расчеты:

L = 4π · 144 · 10¹⁶ м² · 5,67 · 10⁻⁸ Вт · м⁻² · K⁻⁴ · 4 096 · 10¹² К⁴ \approx

\approx 42 025 739,4 · 10²⁰ Вт

Ответ: L \approx 42 025 739,4 · 10²⁰ Вт.

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