What are the areas of wellness and how can it be incorporated into one’s daily life

The air that we breath is made mostly of which gaseous molecule

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

What is friction? how does it affect the motion of an object?