Alice is farsighted and cannot see objects clearly that are closer to her eye than 80.0 cm. what is the refractive power of the contact lenses that will enable her to comfortably see objects at a distance of 25.0 cm from her eyes?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

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 inner planets or call terrestrial because they