[填空题]
Two stars, whose spectra pea 9i. by/u5gdzrk at 600 nm and 400 nm, respectively, bobzy 4kwev4+5.x 6od tcth lie on the main sequence. Use Wien's law, the Stefan-Boltzmann equation, and the H-R diagram (Fig. Below) to estimate the ratio of their diameters. [t4bdx5+zo. wyev4k 6cHint: see Examples 33-4 and 33-5.] $\dfrac{d_{400}}{d_{600}}$ =
