Two spherical blackbody stars A and B have the same radius

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Two spherical blackbody stars A and B have the same radius. Their wavelengths of maximum emission are

400\,\text{nm}

and

600\,\text{nm}

respectively. Find the ratio of their luminosities

L_A : L_B