Alaser light was shone through a diffraction grating whose lines were 1/1000 mm apart. the distance was measured between the center spot and the first side spot and found to be 99 mm. the distance from the dif‐ fraction grating to the first side spot was found to be 154 mm. calculate the wavelength of light in nm that the laser pointer was emitting

The reaction q+r2=r2q is found to be first order in r2 and

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.