Loose End: Put the tension bar to "High" (rightmost position), and the dumping bar to "None". Choosing the appropriate frequency, bring the string with the loose end into a state of basic resonance mode (lowest frequency). What is the frequency of the basic resonance mode in Hz

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?