Flag Thermal Physics> The emissivity of a spherical body is 0.2...
question mark

The emissivity of a spherical body is 0.250. A spherical body with an unknown radius is suspended with a large evacuated enclosure whose walls are at 300K. If the power input required to maintaining the sphere at a temparature of 2500K is 5.5*10^3W, then find the radius of the sphere? (Hint:-By Stefen-Boltzman Law!!) Get the Answer......

S RAMYA , 9 Years ago
Grade 11
anser 1 Answers
PASUPULETI GURU MAHESH

Last Activity: 9 Years ago

Here we have   e=0.250 ,Ts=300k,  T=2500  Heat H=5.5×103 and Stefen Boltzman constant =5.67×10-8 w/(m2 k4)
we know that  H= area × e × Stefen Boltzman constant ×(T4-Ts4)
r2=H/(4 pi e × Stefen Boltzman constant ×(T4-Ts4)
you substitute all the values in above and get value .
Thank you
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments