A Blue Supergiant Star Has a Radius of 7

question 32

Multiple Choice

A blue supergiant star has a radius of 7.4 × 10¹⁰ m.The spherical surface behaves as a blackbody radiator.If the surface temperature is 2.4 × 10⁴ K,what is the rate at which energy is radiated from the star?

• A)1.2 × 10³ J/s
• B)9.4 × 10¹⁹ J/s
• C)2.0 × 10²³ J/s
• D)8.2 × 10³² J/s
• E)1.3 × 10³³ J/s

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