1- An electron in the 8 th energy level of the H atom drops to the 2 th energy l
ID: 501559 • Letter: 1
Question
1- An electron in the 8th energy level of the H atom drops to the 2th energy level. In other words an electron in an excited state drops to a less excited state. What is the energy (in J) of the emitted photon? The energy of an electron in the nth level is
2-The absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun and other stars. What is the energy of a photon (in J) that is absorbed by He+ ions, when an electron is excited from the Bohr orbit with n = 2 to the n = 6 state? The energy of an electron in the nth level is
Explanation / Answer
1)
For nth level, energy is given by
En = -13.6/n^2 eV
E of photon = 13.6*(1/nf^2 - 1/ni^2)
E of photon = 13.6*(1/2^2 - 1/8^2) eV
= 3.1875 eV
E = 3.1875*1.602*10^-19 J
= 5.11*10^-19 J
Answer: 5.11*10^-19 J
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