Put the steps of star formation in the correct order. Reorder answers
1.Clouds of gas and dust form within galaxies.
Reorder answers
2.A disk forms, with a growing "protostar" at the center.
Reorder answers
3.When the protostar begins to undergo fusion, it becomes a real star.
Reorder answers
4.Disturbances cause the formation of clusters with sufficient mass that the gas and dust collapse due to their own gravitational pull.

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?