Size and Brightness In the negative below representing the evening \"sky\", note

Question

Size and Brightness In the negative below representing the evening "sky", note the brighter stars appear as larger dots. Complete the following parts a-c based on the negative, and the magnitude scale below the negative. a) List the lettered stars in order of decreasing brightness: that is, from the brightest to the dimmest, b) Which star would have the largest positive number on the apparent scale? c) If star C has an apparent magnitude of about 2 and star E about 0, determine the approximate apparent magnitude of the stars listed below. Use whole numbers for the approximations, and base your estimates on the relative size of the star images. d) What is the magnitude difference between star C and E? e) Comparing star C and B, which star appears the brighter?

Explanation / Answer

The brighter star has larger diameter.

(a) E>C>D>A>B

(b) B will have largest. (The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth. The brighter an object appears, the lower its magnitude value (i.e. inverse relation).

(c) Star A: 6   

Star B: 8

Star D: 4

(d) 2

(e) C is brighter as it has larger diameter.

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