Stars can be modeled as spherical blackbodies that radiate heat out to an environment assumed to have a temperature of 0 K. Bellatrix is a star that radiates heat per time at a rate of 2.5×1030 watts, and has a surface area of 2.2×1020 m2. The surface temperature of Bellatrix is:
A. 4.2×103 K.
B. 2.1×104 K.
C. 1.1×105 K.
D. 6.1×105 K.
Answer:B
Stars can be modeled as spherical blackbodies that radiate heat out to an environment assumed to have a temperature of 0 K. Bellatrix is a star that radiates heat per time at a rate of 2.5×1030 watts, and has a surface area of 2.2×1020 m2. The surface temperature of Bellatrix is:
A. 4.2×103 K. B. 2.1×104 K. C. 1.1×105 K. D. 6.1×105 K.