Select the correct answer. a ball rolls from point a to point b. the total energy of the ball at point a isn’t the same as the sum of its potential energy and kinetic energy at point b. which statement best explains this situation? a. the rolling ball doesn’t follow the law of conservation of energy. b. some of the ball’s energy is transformed to thermal energy. c. the rolling ball loses some of its energy because of gravity. d. the ball absorbs some of its own potential energy.

The energy released by a nuclear fusion reaction is produced when

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

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?