The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 K is (σ=5.7×10-8 W m-2 K-4)

Question

The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 K is (σ=5.7×10-8 W m-2 K-4) (A) 1.7 x 1010 J (B) 1.1 x 1012 J (C) 2.8 x 108 J (D) 4.6 x 106 J

Tardigrade Admin · Accepted Answer

According to Stefan’s law E=σ T4 Heat radiated per unit area in 1 hour (3600s) is = 5.7× 10-8× (300)4 × 3600= 1.7 × 1010 J

Q. The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 K is $(σ = 5.7 \times 1 0^{- 8} W m^{- 2} K^{- 4})$

$1.7 x 1 0^{10} J$

$1.1 x 1 0^{12} J$

$2.8 x 1 0^{8} J$

$4.6 x 1 0^{6} J$

According to Stefan’s law
$E = σ T^{4}$
Heat radiated per unit area in 1 hour $(3600 s)$ is
$= 5.7 \times 1 0^{- 8} \times (300)^{4} \times 3600 = 1.7 \times 1 0^{10} J$

Q. The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 K is (σ=5.7×10−8Wm−2K−4)

1.7x1010J

1.1x1012J

2.8x108J

4.6x106J