Since the direction of the force and the direction of the path is perpendicular, the person is not doing any physical work.
Well I think B hope this helps
Because dark line spectra result from passing white light through ionized gasses and plasmas, which is what the atmosphere of stars are made of. These frequencies are scattered by the star's atmosphere as it leaves the surface (photosphere) of the star, and don't make it to earth.
Answer is C.
Optical microscope involves passing visible light transmitted through or reflected from the sample through a single or multiple lenses to allow a magnified view of the sample.
C look at how many oxygen, nitrogen’s, and hydrogens there are
