When Viewing the Sun's Disk in Visible Light, One Sees

question 38

Multiple Choice

When viewing the Sun's disk in visible light, one sees less deeply into the Sun near the limb than at the center of the disk because of the interaction of the light with atoms of the gas. What conclusion can be drawn from the observation that the Sun appears less bright near the limb than it does at the disk center?

• A) The light from the solar limb is redshifted because of solar rotation, and this phenomenon gives the appearance of cooler gas at the limb.
• B) The temperature of the gas increases with increasing height in the solar atmosphere.
• C) The light has to travel through more of the solar corona from the limb; hence, it is reduced in intensity and appears cooler.
• D) The temperature of the gas falls with increasing height in the solar atmosphere.

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