A solid sphere is at temperature t. the sphere is cut into two halves. the fraction of energy emitted per second by half sphere to that by complete sphere is
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hey guys I have this question answer☺
urface area of complete sphere is 4piR2 ..............(1)
R is radius of complete sphere
r is radius of hemisphere
Now it is cut into two parts both hemisphere
so new areas is area of two hemisphere i.e 3pir2 + 3pir2 = 6pi r2
6pi r2 = 90
pi r2 = 15
put this value in equation 1
4 x 15 = 60 cm2
urface area of complete sphere is 4piR2 ..............(1)
R is radius of complete sphere
r is radius of hemisphere
Now it is cut into two parts both hemisphere
so new areas is area of two hemisphere i.e 3pir2 + 3pir2 = 6pi r2
6pi r2 = 90
pi r2 = 15
put this value in equation 1
4 x 15 = 60 cm2
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