Write two ways to be protected from the energy crisis?​

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

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?

The focal length of a lens is determined by the curve of the lens and the material that the lens is made from. (5 points) is this true or false? ?