30.32- Applications of Atomic Excitations and De-Excitations The energy level di

Question

30.32- Applications of Atomic Excitations and De-Excitations The energy level diagram below is for a hypothetical laser. Light is pumped into the system which bring the electrons from the ground state to the other excited states. What wavelength is emitted by the laser? Third 3.2 eV 2.52 eV Meta stable 2.09 ev Second First Ground state 0 ev Submit AnswerIncompatible units. No conversion found between "ev" and the required units. Tries 0/10 Previous Tries What energy photons can pump the atoms from the ground state to its second excited state? What is the corresponding wavelength? Energy Wavelength- Suomit Answer Tries 0/10 What energy photons can pump the atoms from the ground state to its third excited state? What is the corresponding wavelength? Energy Wavelength Submit Answer Tries 0/10

Explanation / Answer

1) E_photn = E_second - E_ground

= 2.52 eV - 0

= 2.52 eV

now use, E_photon = h*c/lamda

lamda = h*c/E_photon

= 6.626*10^-34*3*10^8/(2.52*1.6*10^-19)

= 4.93*10^-7 m or 493 nm

2)

E_photn = E_third - E_ground

= 3.2 eV - 0

= 3.2 eV

now use, E_photon = h*c/lamda

lamda = h*c/E_photon

= 6.626*10^-34*3*10^8/(3.2*1.6*10^-19)

= 3.88*10^-7 m or 388 nm

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