Question

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Answer 1

$1) = \frac{4}{7} \\ \\ 2) = \frac{49}{81} \\ \\ 3) = 18 \\ \\ 4) = 18$

Answer 2

Answer:

Black-body radiation is the thermal electromagnetic radiation within, or surrounding, a body in thermodynamic equilibrium with its environment, emitted by a black body.

Step-by-step explanation:

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