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The unit of Stefan's constant $\sigma $ is
  • A$W\,{m^{ - 2}}\,{K^{ - 1}}$
  • B$W\,{m^2}\,{K^{ - 4}}$
  • C$W\,{m^{ - 2}}\,{K^{ - 4}}$
  • D$W\,{m^{ - 2}}\,{K^4}$
AIPMT 2002, Easy
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