Heat TransferEasy
Question
A black body is at temperature if 2800 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. Then Wien constant, b = 2.88 × 106 nm-K. Then
Options
A.U1 = 0
B.U3 = 0
C.U1 > U2
D.U2 > U1
Solution
: 
Wien′s displacement law is
λm T = b (b = Wien′s constant)
∴ λm =
∴ λ = 1000 nm
Enrgy distribution with wavelength will be as follows
From the gram it is clear that
U2 > U1 [In fact U2 is maximum]
Wien′s displacement law is
λm T = b (b = Wien′s constant)
∴ λm =
∴ λ = 1000 nm
Enrgy distribution with wavelength will be as follows
From the gram it is clear that
U2 > U1 [In fact U2 is maximum]
Create a free account to view solution
View Solution FreeMore Heat Transfer Questions
The solar constant for the earth is ∑. The surface temperature of the sun is T K. The sun sub tends an angle θ...Ice starts forming in lake with water at 0oC and when the atmospheric temperature is −10oC. If the time taken for ...The temperature of hot and cold end of a 20 cm long rod in thermal steady state are at 100oC and 20oC respectively. Temp...A piece of metal and a block of wood are placed in a room. The temperature of both is 45o c on touching them:...Two spheres of radii in the ratio 1 : 2 and densities in the ratio 2 : 1 and of same specific heat, are heated to same t...