Physical World Units and Measurements - Result Question 4
4. The unit of the Stefan-Boltzmann’s constant is
(a) $W / m^{2} K^{4}$
(b) $W / m^{2}$
(c) $W / m^{2} K$
(d) $W / m^{2} K^{2}$
[2002]
Show Answer
Answer:
Correct Answer: 4. (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
$\sigma=\frac{E}{A T^{4}}=\frac{W}{m^{2} K^{4}}$
