When metallic sodium is dissolved in liquid sodium chloride, electrons are released into the liquid. these dissolved electrons absorb light with a wavelength near 800 nm. suppose we treat the positive ions surrounding an electron very crudely as defining a three-dimensional cubic box of edge l, and we assume that the absorbed light excites the electron from its ground state to the first excited state. calculate the edge length l within this simple model.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.

Answer(d) unstable compounds that convert to acetals in the presence of alcohol and an acid; (b) semiacetals produced by alcohol subtraction from ketone;