Question
The plots of intensity versus wavelength for three black bodies at temperature $${T_1},$$ $${T_2}$$ and $${T_3}$$ respectively are as shown. Their temperatures are such that
The plots of intensity versus wavelength for three black bodies at temperature $${T_1},$$ $${T_2}$$ and $${T_3}$$ respectively are as shown. Their temperatures are such that
A.
$${T_1} > {T_2} > {T_3}$$
B.
$${T_1} > {T_3} > {T_2}$$
C.
$${T_2} > {T_3} > {T_1}$$
D.
$${T_3} > {T_2} > {T_1}$$
Answer :
$${T_1} > {T_3} > {T_2}$$
Solution :
According to Wien's law, $$\lambda T = {\text{constant}}$$
From graph $${\lambda _1} < {\lambda _3} < {\lambda _2}$$
$$\therefore \,\,{T_1} > {T_3} > {T_2}.$$
According to Wien's law, $$\lambda T = {\text{constant}}$$
From graph $${\lambda _1} < {\lambda _3} < {\lambda _2}$$
$$\therefore \,\,{T_1} > {T_3} > {T_2}.$$