Consider the following energy levels of a hypothetical atom Ед -2.11 х 10 -19 Ез -7.01 х 10-19 E, -1.05 х 10 J 18 J J E-1.85 x 10-18 (a) What is the wavelength of the photon needed to excite an electron from E1 to E4? x 10 m (b) What is the energy (in joules) a photon must have in order to excite an electron from E2 to E3? x 10 (c) When an electron drops from the E3 level to the E1 level, the atom is said to undergo emission. Calculate the wavelength of the photon emitted in this process. х 10

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