The emissivity of tungsten is aproximately 0.35. A tungsten sphere 1 cm in radius is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along the support is neglected?`sigma=5.67xx10^-8` SI units.

The emissivity of tungsten is approximately 0.35. A tungsten sphere 1 cm in radius is suspended within a large evacuated inclosure whose walls are at 300K. What power input is required to maintain the sphere at a temperature of 3000K? (sigma=5.67xx10^(-8)" in SI unit")

The emissivity of tungsten is 0.4. A tungsten sphere with a radius of 4.0 cm is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along supports is neglected ? Take, sigma = 5.67 xx (10^-8) Wm^2-K^4 .

The emissivity of tungsten is 0.4. A tungsten sphere with a radius of 4.0 cm is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along supports is neglected ? Take, sigma = 5.67 xx (10^-8) Wm^2-K^4 .

A blackened solid copper sphere of radius 2 cm is placed in an evacuated enclosure whose walls are kept at 100^(@)C . At what rate must energy be supplied to the sphere to keep its temperature constant at 127^(@)C ? Stefan constant = 5.67xx 10^(-8)Jm^(-2)K^(-4).

A spherical black body of 5 cm radius is maintained at a temperature of 327^(@)C . Then the power radiated will be (sigma=5.7xx10^(-8)"SI unit")

A spherical black body of 5 cm radius is maintained at a temperature of 327^@C . Then the power radiated will be ( sigma = 5.7 xx 10^(-8) SI unit )

A sphere of radius 10 cm is hung inside an oven walls are at a temperature of 1000 K. Calculate total energy incident per second (in Js^(-1) ) on the sphere. Given sigma = 5.67 xx 10^(-8) SI units.