The unit of Stefan Boltzmann constant is

This question was previously asked in

ISRO Refrigeration and Air Conditioning 2019 Official

- Watt/cm
^{2}K - Watt/cm
^{4}K Watt/cmK

^{4}Watt/cm

^{2}K^{4}

Option 4 :

Watt/cm^{2}K^{4}

Free

ISRO Scientist ME 2020 Paper

1538

80 Questions
240 Marks
90 Mins

__Explanation:__

- Stefan's Law: According to it the radiant energy emitted by a perfectly black body per unit area per sec (i.e. emissive power of black body) is directly proportional to the fourth power of its absolute temperature i.e.

E ∝ T4

E = σT4

Where σ is a constant called Stefan’s Boltzmann constant.

- The value of Stefan's constant is 5.67 × 10-8 W/m2K4.
- Its unit is W/m2K4 or
**W/cm**.^{2}K^{4}

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