PLEASE HELP The energy input of an engine is 4 times greater than the work it performs. What is its thermal efficiency? Group of answer choices 0.25 0.5 0.75 1 4

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?