pearrrrrrr wrote:
GMATNinja wrote:
adkikani wrote:
Hi Experts / GMATNinjaTwo
Q116:
As per passage:
It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center
which implies: as distance increases form center / nucleus, luminosity decreases.
Then why OA is D, I am clear about rotationalvelocity
Q116:
As per passage:
It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center
which implies: as distance increases form center / nucleus, luminosity decreases.
Then why OA is D, I am clear about rotationalvelocity
Yes, as distance from the center increases, luminosity decreases. This is consistent with choice (D): In comparison with the outermost regions of a typical spiral galaxy, the region just outside the nucleus can be characterized as having higherluminosity . In other words, the luminosity is lower in the outermost regions than the luminosity just outside the nucleus.
We also know "that the rotational velocity in spiral galaxies either remains constant with increasing distance from the center or increases slightly." This is also consistent with choice (D): In comparison with the outermost regions of a typical spiral galaxy, the region just outside
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Statistics : Posted by DmitryFarber • on 30 Aug 2009, 02:15 • Replies 49 • Views 71956
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