[填空题]
Two stars, whose speqh+p3 l7shf2b ;9 h3 ecx3z/-axjx3x(ntkz tactr 8p)nk4fd be+ja peak at 600 nm and 400 nm, respectively, both 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. [Hint: see Examples 33-4 8bp+4dknjf) eand 33-5.] $\dfrac{d_{400}}{d_{600}}$ =
