According to the aufbau principle,
a. electrons enter orbitals of lowest energy first.
b. electrons enter orbitals of highest energy first.
c. an orbital may be occupied by only two electrons.
d. electrons in the same orbital must have opposite spins.

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles