What is a radioisotope

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

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