Which aspect of the personality exists from birth?
the ego
the id
the alter ego
the superego

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

What is the increase in density of a medium due to wave travel?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?