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

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 :

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 :

Two spherical black bodies A and B are emitting radiations at same rate. The radius of B is doubled keeping radius of A fixed. The wavelength corresponding to maximum intensity becomes half for A white it ramains same for B. Then, the ratio of rate radiation energy emitted by a and is B is

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 metal spheres have radii rand 2r and they emit thermal radiation with maximum intensities at wavelengths lambda and 2lambda . respectively. The respective ratio of the radiant energy emitted by them per second will be

In Lyman series the wavelength lambda of emitted radiation is given by (R is rydberg constant)