10) If the absolute refractive index of a medium is √2, what is the critical angle of that medium with respect to air? (a) 24° (b) 30° (c)45° (d) 60°​

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

Use vsepr theory to predict the molecular geometry of the molecule hcn.

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−21 newtons?