Adolphin emits ultrasound of 100khz and uses the timings of reflection to determine the position of objects in the water. what is the wavelengths of this ultrasound? note the speed of sound in water is 1480m/s.

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?