Acluster of atoms whose magnetic fields are aligned in the same direction is a magnetic

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

If y gets smaller as x gets bigger and y have an relationship?

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?