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The unit of Stefan's constant sigma is...

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)`

Text Solution

Verified by Experts

The correct Answer is:
C
Stefan’s law
`(E)=sigmaT^4 implies sigma=E/(T^4)`
where E `= ("Energy")/("Area" xx "time") = ("watt")/m^2`
`sigma=("watt")/(m^2K^4)=` watt `m^(-2)K^(-4)`
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