Two stars A and B of radius 2R and R respectively radiates power like perfectly black body in the ratio 1:4 .Their peak wavelengths (corresponding to maximum spectral power) differs by `150nm` .Sum of their temperatures on surface is `500 alpha K`. Find `alpha` .Given, Wien's constant `b=3times10^(6)K-nm`

For the moon, the wavelength corresponding to the maximum spectral emissive power is 14 microns. If the Wien's constant b=2.884 xx10^(-3)mK , then the temperature of the moon is close to

Two stars A and B of same size, have thermal emissivities of 0.2 and 0.64 respectively. Both stars emit total radiant power at same rate. If the temperature of A is 5000 K and the wavelength lamda_(B) corresponding to maximum spectral radiancy in the radiation from B is shifted from the wavelength corresponding to maximum spectral radiancy in radiations from A by 2.0 mu m, then find the temperature of star B and wavelength lamda_(B) .

Two bodies A and B having equal outer surface areas have thermal emissivity 0.04 and 0.64 respectively. They emit total radiant power at the same rate. The difference between wavelength corresponding to maximum spectral radiance in the radiation from B and that from A is 2 mum . If the temperature of A is 6000 K, then

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are same. The two bodies emit total radiant power at the same rate. The wavelength lambda_B corresponding to maximum spectral radiancy from B is shifted from the wavelength corresponding to maximum spectral radiancy in the radiation from A by 1.0 mum . If the temperature of A is 5802 K, calculate (a) the temperature of B, (b) wavelength lambda_B .

The surface temperature of a black body is 1200 K. What is the wavelength corresponding to maximum intensity of emission of radiation if Wien's constant b = 2.892xx10^(-3)mK ?

Three discs A, B and C having radii 2 m, 4m, and 6 m, respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 3 m, 4 m and 5 m respectively. The power radiated by them are P_(A),P_(B)andP_(C ) respectively. Find the ratio of powers emitted by the three discs.

Two black bodies A and B at temperatures 5802 K and 1934 K emits total radiations at the same rate. The wavelength lamda_(B) corresponding to maximum spectral radiancy from B is shifted from the wavelength corresponding to maximum spectral radiancy in the radiation from A by 1.00mum . Then

Two spheres A and B having radii 3 cm and 5 cm respectively are coated with carbon black on their outer surfaces. The wavelengths of maximum intensity of emitted radiation are 300 nm and 500 nm respectively. If the powers radiated are Q_A and Q_B respectively, then (Q_A)/(Q_B) is

Three discs, A, B and C having radii 2m, 4m and6m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 300nm, 400nm and 500 nm , respectively. The power radiated by them are Q_A, Q_B and Q_C respectively (a) Q_A is maximum (b) Q_B is maximum (c) Q_C is maximum (d) Q_A = Q_B = Q_C