Which law states, "The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature".

Which law states, "The radiant energy emitted by a black body per unit

1.	Which law states, "The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature".
A.	Stefan's law
B.	Doppler's effect
C.	Kirchhoff's law
D.	Newton's law of cooling
Answer» B. Doppler's effect