Question

A body of area 1 cm2 is heated to a temperature
1000 K. The amount of energy radiated by the body
in 1 s is (Stefan's constant o = 5.67x10-8 Wm-2 K-4)
O 5.67 joule
O 0.567 joule
O 56.7 joule
O 567 joule​

Answer 1

Answer:

5.67 joule

Explanation:

Ans is in the attachment

Answer 2

Given,

Area A = 1 $cm^{2}$,

Temperature (T) = 1000 K,

Time (t) = 1 second,

Stefan's constant σ =5.67 × $10^{-8}W^{-2}K^{-4}$

To find,

Energy (E),

Solution,

To find the heat radiated by a body we use a very simple relation,

E = σA$T^{4}$t,

Area A= 1$cm^{2}$ = $10^{-4}$$10^{-4}$$m^{2}$,

⇒ E = 5.67 × $10^{-8}$ × $10^{-4}$  × $1000^{4}$ × 1,

⇒ E = 5.67 Joule.

(Option A).