An atom in an excited state has a mass of 63.332 and then decays to a mass of 63.329 amu by emitting 3 x-rays of equal energy. a) What is the energy (in keV) and wavelength of each x-ray? b) If one of these X-rays is absorbed by a neighbouring atom and ejects a K-shell electron, what is the velocity of the electron? (note: K-shell binding energy is 43 keV)

At what speed must an electron travel to have a wavelength of 13.6 pm ?

An atom in a state with its orbital quantum number l = 1 decays to its ground state (with l = 0). A photon of wavelength 630.000 nm is emitted in the process. When the same process takes place in the presence of an intense magnetic field, the following change in the spectrum is observed. With the magnetic field present, one of the emitted lines observed now has a wavelength of 630.030 nm. Which of the following wavelengths would you expect to be also present? Group of answer choices 630.120 nm 630.060 nm 630.090 nm 629.910 nm 629.970 nm

The nuclear reaction n + ¹B → 3Li + He is observed to occur when very slow-moving neutrons strike boron atoms at rest. For a particular reaction, the outgoing helium is observed to have a speed of 9.3 x 106 m/s. Determine a) the kinetic energy of the lithium in MeV. b) the total energy released by the reaction in MeV.