All the problems below refer to the electron in a hydrogen atom. e. a a 1) consider the electron in the 2s state (i) calculate the expectation value of the distance between the electron and the nucleus, . (ii) calculate the expectation value of the reciprocal distance between the electron and the nucleus, < 1/r [hint: you can find both these quantities by integrating only the radial part of the wavefunction because the 2s orbital is spherically symmetric.] (iii) is < 1/r> the same as 1/? why / why not? (iv) what is the physical meaning of < 1/r> ?

When a neutral charge, comes into contact with a positive charge they repel each other nothing happens the neutral charge becomes negative they attract each other

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.