Heat TransferHard
Question
Radius of two spheres of same material are 1 & 4 m respectively and their temp. are 4 × 103 and 2 × 103 K respectively. Then ratio of emitted energy of spheres per sec. will be -
Options
A.1 : 21 : 2
B.2 : 1
C.1 : 1
D.4 : 1
More Heat Transfer Questions
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is :-...A body takes 4 minutes to cool from 100oc to 70oc. If the room temperature is 150 c then how many minutes will it need t...Two rectangular blocks A and B of different metals have same length and same area of cross-section. They are kept in suc...There is ice formation on a tank of water of thickness 10 cm, how much time it will take to have a layer of 0.1 cm. belo...A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K)...