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Câu 3:

Hằng số bức xạ ${\sigma _o}$

Câu 3: Hằng số bức xạ σo{\sigma _o}σo​ của vật đen tuỵêt đối bằng:

Thông tin câu hỏi

Câu 3:

Hằng số bức xạ ${\sigma _o}$ của vật đen tuỵêt đối bằng: