Figure 9-5 in Comins,Discovering the Essential Universe,6th ed.,shows an image taken through a filter that passes the red Hα hydrogen line and blocks other wavelengths.Why does this image show the chromosphere but not the photosphere?
A) The chromosphere is cooler than the photosphere and therefore emits Hα, while the warmer photosphere does not.
B) The chromosphere is warmer than the photosphere and therefore emits Hα, while the cooler photosphere does not.
C) The photosphere lacks hydrogen and therefore cannot emit Hα.
D) The Hα emitted by the photosphere is blocked by the chromosphere.
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