The unit of Stefan's constant is

1) Wm-2K-1

2) WmK-4

3) Wm-2K-4

4) Nm-2K-4

Answer: 3) Wm-2K-4

Solution:

According to Stefan’s law, the energy radiated per second or power radiated is given as

σAT4

σ = P/AT4

Therefore, the unit of Stefan’s constant is Wm-2K-4

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