Consider a hydrogen absorption line that has a rest wavelength of 121.6 nanometers (nm). Suppose you identify this line in the spectrum of a quasar at three different wavelengths: 262 nm, 470 nm, and 690 nm. What can you conclude

The best description is: . nobody has any idea what q is.

Current supplied to consumers from generating plants like coal power plant, nuclear power plant, geothermal and others are in form of alternating current instead of direct current because it can be transported easily in a long distance. also, the alternating current has a wide range of frequency and the amount or energy can be increased or decreased.