7 When a block of mass 2 kg was pushed along a horizontal flat surface of a table, the
frictional force was measured to be 4 N. Then the same block was pushed along the
same table with a force of 10 N. Which option best describes the state of motion
experienced by the block?

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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?