Heat TransferHard
Question
The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the the centre of a star of radius r, whose outer surface radiated as a black body at a temperature T K is given by
(where σ is Stefan′s constant)
(where σ is Stefan′s constant)
Options
A.
B.
C.
D.
Solution
According to the Stefan′s Boltzmann law, the power radiated by the star whose outer surface radiated as a black body at temperature T K is given by
P = σ4πr2T4
where,
r = radius of the star
σ= Stefan’s constant
The radiant power per unit area recived at distance R from the centre of star is
P = σ4πr2T4
where,
r = radius of the star
σ= Stefan’s constant
The radiant power per unit area recived at distance R from the centre of star is
Create a free account to view solution
View Solution FreeMore Heat Transfer Questions
A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250nm is U1, at wa...The layers of atmosphere are heated through -...The figure below shows the variation of specific heat capacity (C) of a solid as a function of temperature (T). The temp...There is a black spot on a body. If the body is heated and carried in a dark room then it glows more. This can be explai...2 gms steam at 100o C is mixed with 5 gm ice at - 40oC in an ideal calorimeter. The final temperature of the system will...