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Semiconductors and Superconductors

56.The emissi...

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56.The emissisivity of tungsten is approximately 0.35. A tungsten sphere 1 cm in radius is suspended within a large evacuated enclose whose walls are at 300k. What power input is required to maintain the sphere at a temperature of 3000k, if heat conduction along the support is neglected?

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Q. The emissivity of tungsten is approximately

0.35

. A tungsten sphere

1 cm

in radius is suspended within a large evacuated enclosure whose walls are at

300 K

. Find power input required to maintain the sphere at a temperature of

3000 K

, if heat conduction along the supports is neglected?

ρ = 5.67 \times 10^{- 8} SI units

Q. The emissivity of tungsten is approximately

0.35

. A tungsten sphere having

1 cm

radius is suspended within a large evacuated enclosure whose walls are at

300 K

. Find the power input required to maintain the sphere at a temperature of

3000 K

if heat conduction along the support is neglected.

σ = 5.67 \times 10^{- 8} SI units

.

Q. The emissivity of tungsten is approximately

0.35

. A tungsten sphere having

1 cm

radius is suspended within a large evacuated enclosure whose walls are at

300 K

. Find the power input required to maintain the sphere at a temperature of

3000 K

if heat conduction along the support is neglected.

σ = 5.67 \times 10^{- 8} SI units

.

Q. The emissivity of tungsten is approximately 0.35 A tundsten sphere 1 cm in radius is suspended within a large evacuated incloser whose walls are at 300 K. What power input is rquired to maintain the sphere at a temperature of 3000 K? (

σ = 5.67 \times 10^{- 8} i n S I u n i t

Q. A copper sphere is suspended in an evacuated chamber maintained at 300 K. The sphere is maintained at a constant temperature of 500 K by heating it electrically. A total of 210 W of electric power is needed to do it. When the surface of the copper sphere is completely blackened, 700 W is needed to maintain the same temperature of the sphere. Calculate the emissivity of copper.

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