1. Theabsorption spectra of ions have been used to identify the presenceof the elements in the atmospheres of the sun and other stars. Whatis the wavelength of light (in nm) that is absorbed byHe+ ions, when an electron is excited from the Bohrorbit with n = 2 to the n = 7 state? The energy of an electron inthe nth level is
2. Anelectron in the 4th energy level of the H atom drops tothe 1st energy level. In other words an excited electrondrops to the ground state. What is the energy (in J) of the emittedphoton)? The energy of an electron in the nth level is
An unknown element was tested using a spectroscopic technique. Light was emitted from the sample at a wavelength of 525.6 nm. Calculate the energy of a photon and the energy of one mole of photons of the light.
