Question

Martian CO₂ laser. Where sunlight shines on the atmosphere of Mars, carbon dioxide molecules at an altitude of about 75 km undergo natural laser action. The energy levels involved in the action are shown in the figure; population inversion occurs between energy levels E₂ and E₁. (a) What wavelength of sunlight excites the molecules in the lasing action? (b) At what wavelength does lasing occur? (c) In what region of the electromagnetic spectrum do the excitation and lasing wavelengths lie?

Answer 1

PLEASE LET ME KNOW IF YOU HAVE ANY DOUBT, I AM HERE TO HELP !!!!!

PLEASE LET ME KNOW IF YOU HAVE ANY DOUBT, I AM HERE TO HELP !!!!!

a)

Excitation occurs from ground state to second exited state. Hence the energy difference between the two states is given.

You did not give the values of energy level ??

Here is the equation which you can use

= hc / E₂ - E_o

where, E₂ is the energy for second level and E_o is the energy for ground level. These must be given to in the diagram

hc = 1240 eV. nm

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b)

lasing occurs when electron jumps down from higher energy level

= hc / E₂ - E₁

same method, just read the values of E2 and E1 from the diagram

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c)

These both wavelengths will lie in INFRARED regions of spectrum ( because this is a laser)