A linear chain is made up of sodium and chlorine atoms alternately placed with neighboring equilibrium positions separated by 0.281 nm. A Na atom has a mass of 3.82x10-26 Kg and a Cl atom has a mass of 5.89x10-26 Kg. Suppose the atoms interact electrostatically, with each sodium atom having a net charge of e and each chlorine of -e. Estimate the maximum and minimum angular frequency in each branch of the dispersion relation (i. e., acoustical and optical branches).

Asolution at 25 degrees celsius is 1.0 × 10–5 m h3o+. what is the concentration of oh– in this solution?

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?