Question 357: Properties of Matter

Question

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U
1
, at wavelength 500 nm is U
2
and that at 1000 nm is U
3
. Wien's constant, b = 2.88 $$ 	imes $$ 10
6
nm K. Which of the following is correct ?

Accepted Answer

According to wein's displacement law, maximum amount of emitted radiation corresponding to
$${\lambda _m} = {b \over T}$$
$${\lambda _m} = {{2.88 	imes {{10}^6}nmK} \over {5760K}} = 500\,nm$$
From the graph U
1
 U
3

Answer

U
1
> U
2

Answer

U
2
> U
1

Answer

U
1
= 0

Answer

U
3
= 0

Properties of Matter

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U 1 , at wavelength 500 nm is U 2 and that at 1000 nm is U 3 . Wien's constant, b = 2.88 $ \times $ 10 6 nm K. Which of the following is correct ?

Choose the correct answer: