What is the energy of the electron in the ground state? What is the energy of the electron in the first excited state? If the electron makes the transition shown by the red arrow, from A to C, will a photon be absorbed or emitted? Calculate the wavelength of the photon that would be absorbed or emitted. Round your answer to 3 significant digits. 250 ZJ 400 ZJ O absorbed emitted nm

A certain shade of blue has a frequency of 7.25 × 1014 Hz. What is the energy of exactly one photon of this light? Planck's constant is h = 6.626 × 10-34 J.s. E = J

A particular form of light is found to have a wavelength of 459 nm. Calculate the frequency of this light in Hz. (1 Hz = 1/s)

A photon of light with a wavelength of 200.0 nm strikes a metal surface and an electron is ejected with a measured velocity of 7.26 x 105 m/s. Given the following table of threshold energies, identify the metal. Metal Copper Lead Gold Platinum Threshold Energy 7.53 x 10-19 J 6.63 x 10-19 J 8.17 x 10-19 J 9.05 x 10-19 J Lead Gold Copper Platinum