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How many watt of energy is required to k...

How many watt of energy is required to keep a black body in the form of a cube of side `1cm` at `2000K` (Temprature of surroding is `27^(@)c` and `sigma = 5.57 xx 10^(-5) Wm^(-2) K^(-4)`.

A

`444KW`

B

`544KW`

C

`644 KW`

D

`64 KW`

Text Solution

Verified by Experts

The correct Answer is:
B
`P = sigma A (T^(4) -T_(s)^(4))`
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