Quantum transitions that result in the characteristic sharp lines of the x-ray spectrum always involve
1. protons within the nucleus.
2. emission of beta particles from the nucleus.
3. electron energy levels that have the same principal quantum number.
4. neutrons within the nucleus.
5. the inner electron shells.

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Nonpoint source pollution is difficult to control because it

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.