Physical World Units And Measurements Ques 36
36. The unit of the Stefan-Boltzmann’s constant is
[2002]
(a) $W / m^{2} K^{4}$
(b) $W / m^{2}$
(c) $W / m^{2} K$
(d) $W / m^{2} K^{2}$
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Answer:
Correct Answer: 36.(a)
Solution:
- (a) According to Stefan’s law, $E=\sigma AT^{4}$ where, $E$ is energy dissipated per second,
$A=$ surface area
$T=$ absolute temperature
$\sigma=\frac{E}{A T^{4}}=\frac{W}{m^{2} K^{4}}$
BETA
