Astro Quiz
•Two stars are the same distance and size, but one looks brighter. It must also be hotter.
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•Two stars are the same distance and temperature, but one looks brighter. It must also be larger.
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•Two stars are the same size and temperature, but one looks brighter. It must also be bluer.
Which statement below is FALSE?
Reminder:  The wavelength of the peak follows “Wein’s law”: lmax(nm)=3x106 / T(K)     (so hotter sources are bluer). The total energy emitted (or total area under the curve) by hotter sources of the same size goes up like T4 , and they are brighter at all wavelengths.