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The MKS unit of stefan -Boltzmann consta...

The MKS unit of stefan -Boltzmann constant is

A

watt`m^-1k^-4`

B

watt`m^-2k^-4`

C

watt`m^-2k^-2`

D

Cal`m^-2k^-4`

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The correct Answer is:
B
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