The light from andromeda galaxy takes about 2.6 million years to reach earth. which of these statements is correct about the andromeda galaxy? a. it is located at a distance of 2.6 million light years from earth. b. it has to travel a distance of 2.6 million kilometers to reach earth. c. it can be photographed by a space telescope in 2.6 million years. d. it has to move at the rate of 2.6 million kilometers per hour to reach earth.

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?