Two spherical starts A and B emit black body radiation. The radius of A is 400 times that of B and A emits `10^(4)` times the power emitted from B. The ratio `(lambda_(A)//lambda_(B))` of their wavelengths `lambda_(A)` and `lambda_(B)` at which the peaks oc cur in their respective radiation curves is :

Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10^4 times the power emitted from B. The ratio ((lambda_A)/(lambda_B)) of their wavelengths lambda_A and lambda_B at which the peaks occur in their respective radiation curves is

The ratio of half-life times of two elements A and B is (T_(A))/(T_(B)) . The ratio of respective decay constant (lambda_(A))/(lambda_(B)) ,is

A dye absorbs a photon of wavelength lambda and re - emits the same energy into two phorons of wavelengths lambda_(1) and lambda_(2) respectively. The wavelength lambda is related with lambda_(1) and lambda_(2) as :

A dye absorbs a photon of wavelength lambda and re - emits the same energy into two phorons of wavelengths lambda_(1) and lambda_(2) respectively. The wavelength lambda is related with lambda_(1) and lambda_(2) as :

A dye absorbs a photon of wavelength lambda and re - emits the same energy into two phorons of wavelengths lambda_(1) and lambda_(2) respectively. The wavelength lambda is related with lambda_(1) and lambda_(2) as :

Two bodies Aand B of equal surface area have thermal emissivities of 0.01 and 0.81 respectively . The two bodies are radiating energy at the same rate. Maximum energy is radiated from the two bodies A and B at wavelength lambda _(A) and lambda _(B) respectively . Difference in these two wavelengths is 1 mu m . If the temperature of the body A is 5802 K, then value of lambda_(B) is

Two black bodies A and B emit radiations with peak intensities at wavelengths 4000 A and 8000 A respectively. Compare the total energy emitted per unit area per second by the two bodies.

Two sources A and B have same power . The wavelength of radiation of A is lambda_a and that of B is lambda_b .The number of photons emitted per second by A and B are n_a and n_b respectively, then

Two sources A and B have same power . The wavelength of radiation of A is lambda_a and that of B is lambda_b .The number of photons emitted per second by A and B are n_a and n_b respectively, then