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Author Question: A giant star radiates energy at the rate of 3.0 1030 W, and its surface temperature has been ... (Read 44 times)

nummyann

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on: Jul 29, 2018
A giant star radiates energy at the rate of 3.0  1030 W, and its surface temperature has been measured to be 3000 K. Assuming that it is a perfect emitter, what is the radius of this star? ( = 5.67  10-8 W/m2  K4)
 
  A) 7.8  1010 m
  B) 8.7  1010 m
  C) 1.4  1010 m
  D) 1.9  1011 m
  E) 2.3  1011 m

Question 2

The radius of a star is 6.95  108 m, and its rate of radiation has been measured to be 5.32  1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? ( = 5.67  10-8 W/m2  K4)
 
  A) 6.27  103 K
  B) 8.25  103 K
  C) 8.87  103 K
  D) 3.93  107 K
  E) 5.78  107 K


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cat123

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Reply #1 on: Jul 29, 2018
Answer to Question 1

E

Answer to Question 2

A


nummyann

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Reply 2 on: Jul 29, 2018
Gracias!

vickyvicksss

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Reply 3 on: Yesterday
Wow, this really help

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