Ahelium-neon laser (λ = 632.8 nm) is used to calibrate a diffraction grating. if the first-order maximum occurs at 20.6°, what is the spacing between adjacent grooves in the grating? (in this problem, assume that the light is incident normally on the gratings.)

Niobium forms a substitutional solid solution with vanadium. compute the number of niobium atoms per cubic centimeter for a niobium-vanadium alloy that contains 24 wt% nb and 76 wt% v. the densities of pure niobium and vanadium are 8.57 and 6.10 g/cm3, respectively

What property of an object determines its inertia?

Which of these metals are magnetic?