An old iron battery was discarded in this meadow. the iron in the battery is undergoing a change as it rusts. the rusting is changing the battery's color from black to orange.

a) physical
b) chemical
c) environmental
d) none of these changes are occurring

i just want the answer.

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?