Assume that an atom in a metallie crystal belhaves like a mass on a spring. let the angular frequency of oscillation of a copper atom be ω-10' radians/sec, and the copper mass to be 63 hydrogen masses. calculate the atom's classical amplitude of zero-point motion.

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to