1424. The value of Stefan-Boltazman constant in SI unit is September 7, 2025 by Admin 5.6697 x 10-8W/m².°K4 0.1714 x 10-8W/m².°K4 5.6697 x 10-8kcal/m² . °K4 0.1714 x 10-8kcal/m². °K4 ✅ The correct answer is option A.
