Choose the best description of the radial velocity method of locating exoplanets. 1.This method is works well for detecting planets orbiting in close proximity to a star, so the planet can more readily observed passing in front of the star.
2.Planets are timed as they orbit distant stars. The size of the planet can be judged by time duration it takes to transit a star.
3.The orbiting planet causes the star to wobble causing it to appear bluer or more red depending on which direction it moves.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

idk what the question is about