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Sun radiates energy in all direction the average energy received at earth is 1.4 KW/m² . Average distance betn earth and sun is 1.5×10¹¹ m. If the energy is released by conservation of mass and energy then mass lost by sun per day is approximately is ............................kg.

Sun radiates energy in all direction the average energy received at earth is 1.4 KW/m² . Average distance betn earth and sun is 1.5×10¹¹ m. If the energy is released by conservation of mass and energy then mass lost by sun per day is approximately is ............................kg.

Grade:12th pass

1 Answers

Vikas TU
14149 Points
7 years ago
 A = 4•π•r^2 = 4•π•(1.5•10^11)^2 = =9•π•10^22 m^2. 

b. Power density is p =1400 W/m^2. 
The total power is 
P = p•A =1400 • 9•π•10^22 = 
=3.96•10^26 W. 

c. Stefan-Boltzmann Law 
R = σ•T^4, 
R =P/A1 = P/(4• π•r1^2), is the black body irradiance, 
σ =5.67• 10^-8 W•m^-2•K^-4 is the Stefan-Boltzmann constant, 
T =[P/(A1• σ)]^1/4 ={3.96•10^26/[4• π•(6.96• 10^8)^2]}^1/4 = 5800 K.

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