What causes the moon's phases? a. the rotation of the moon on its axis b. the position of the moon each month in relation to the north star c. changes in how much of the sunlit side of the moon faces earth. d. earth's tilt on its axis as it revolves around the sun

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?