Star A has an apparent magnitude of –1.5 and is 12.6 light-years from Earth. Star B has an apparent magnitude of 0.4 and is 15.6 light-years from Earth.  Why should apparent magnitude NOT be used to determine which star is brighter? What information could help you determine which star is brighter?

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Q: Eight droplets of mercury each of radius 1 mm coalesces into a single drop. Find change in the surfa...

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