Heat TransferMedium
Question
Temperature of black body is 3000K when black body colls, then change in wavelength ᐃλ = 9 micron corresponding to maximum energy density. Now temperature of black body is :-
Options
A.300 K
B.2700 K
C.270 K
D.1800 K
Solution
Wien′s displacement law.
λ1T1 = λ2T2 = b = 2.8 × 10-3 km
⇒ 3000 × λ1 - T2 × (λ2 ≡ 3 × 10-3 km
⇒ λ1 = 1 μm & [λ2 - λ1] = 9 μm
⇒ λ2 = 10 μm
⇒ T2 = 300 K
λ1T1 = λ2T2 = b = 2.8 × 10-3 km
⇒ 3000 × λ1 - T2 × (λ2 ≡ 3 × 10-3 km
⇒ λ1 = 1 μm & [λ2 - λ1] = 9 μm
⇒ λ2 = 10 μm
⇒ T2 = 300 K
Create a free account to view solution
View Solution FreeMore Heat Transfer Questions
If a metallic sphere gets cooled from 62oC to 50oC in 10 minutes and in the next 10 minutes gets cooled to 42oC, then th...An irregular rod of same uniform material as shown in figure is conducting heat at a steady rate. The temperature gradie...A body emits light of blue colour on heating. Which light can it emit on further heating ?...The emissive of a black body at T = 200 K is 100 Watt/m2. Consider a body B of area A = 10m2, coefficient of reflectivit...The power radiated by a black body is P and it radiates maximum energy at wavelength λ0. If the temperature of the ...