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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 low is `E = sigma (T^(4)) rArr sigma = (E )/(T^(4)`
where `E = ("energy")/("Area" xx "time") = (Wm)/(m^(2))`
`sigma = (W - m^(-2))/(K^(-4)) = W- m^(-2)K^(-4)`
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