A star of apparent magnitude + 5 looks brighter than one of apparent magnitude +

Question

A star of apparent magnitude + 5 looks brighter than one of apparent magnitude + 2. Star of appears brighter than star B, as seen from Earth of Therefore, star A must be closer to Earth than star B. Differences is stellar spectra are due mainly to differences in composition. A light year is about 3.3 parsecs. Hydrogen lines are weaker in both hotter and cooler stars than in class A stars. Even Alpha Centauri, the closest star, is still over a parse distant. A B9 star is hotter than an AO star. M type stars are cool enough to show molecular lines, such as TiO. To get the space velocity of a star in three dimensions, you need its proper motion, distance, and radial velocity. Only O type stars show ionized helium lines in its spectrum.

Explanation / Answer

Question 1 Answer

A star apparent magnitude +5 looks brighter than one of apparent magnitude +2 is True.

Because apparent magnitude increases as well as brightness increases.

Question 2.Answer

Star A appearts brighter than B, as seen from Earth.Therefore,star A must becloser to Earth than star B is Flase.

Apparent magnitude primarly depends on composition of stars but not as much on distance from earth.

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