Radiant heat Energy Formula with Sample Problems

Radiant heat Energy Formula :

Radiant heat Energy formula E (j) in joule and multiply the Absolute temperature αT4(K) in Kelvin. Hence the Radiant heat Energy Formula can be written as

E (j)*αT4(K)

(Or)

E=σ* T4

Where

Stefan’s constant (5.67*10-8 W/K4) → σ

Radiant energy → E in joule

Absolute temperature → T in kelvin

Sample Problems :

Example 1:

Calculate the radiant heat energy for 1 meter? The surface temperature of the moon in the daytime is 150 Celsius.

Solution :

Known T temperature= 1500 C=150+273K=423K

σ (Stefan’s constant)= (5.67*10-8 W/K4)

Radiant energy  E=σ T4

E=(5.67 *10-8) *(423)4

E=1815.28

The radiant heat energy is 1815.28

Example 2:

Calculate the radiant heat energy for 2 meter? In a surface temperature of the moon in the daytime is 300 Celsius.

Solution :

Known T temperature= 3000 C=300+273K=573K

σ (Stefan’s constant)= (5.67*10-8 W/K4)

Radiant energy  E=σ T4

E=(5.67 *10-8) *(573)4

E= 6112.25

The radiant heat energy is 6112.25

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