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The unit of Stefan-Boltzmann s constant $(\sigma )$ is
  • A$\frac{{wat{t^4}}}{{m \times {K^4}}}$
  • B$\frac{{calorie}}{{{m^2} \times {K^4}}}$
  • C$\frac{{watt}}{{{m^2} \times {K^4}}}$
  • D$\frac{{joule}}{{{m^2} \times {K^4}}}$
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