Part A Which is brighter in our sky, a star with apparent magnitude 4 or a star

Question

Part A
Which is brighter in our sky, a star with apparent magnitude 4 or a star with apparent magnitude 9 ?
Which is brighter in our sky, a star with apparent magnitude 4 or a star with apparent magnitude 9 ?
   A star with apparent magnitude 9.
   A star with apparent magnitude 4.

By how much?
   Part C
Which has a greater luminosity, a star with absolute magnitude -4 or a star with absolute magnitude 11 ?
Which has a greater luminosity, a star with absolute magnitude -4 or a star with absolute magnitude 11 ?
   A star with absolute magnitude -4.
   A star with absolute magnitude 11.

Part D
By how much?

Explanation / Answer

Part A. Star with apparent magitude of 4, lesser the magnitude higher the brightness

Part B. Star with magntidude is brigther by 9-4 =5 magnitudes = 2.512(9-4) = 100 times approximately more brither.

Part C. Star with Absolute magnitude -4 is more luminous than star with magnitude 11.

Part D. It is Luminious by 2.512(11-(-4))= 1000678 times

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