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The separation between the energy levels of a two-level atom is 2 eV . Suppose that 4 × 1020 atoms are in the ground state and 7 × 1020 atoms are pumped into the excited state just before lasing starts. How much energy will be released in a single laser pulse? 
  • a)
    24.6 J
  • b)
    22.4 J
  • c)
    98 J
  • d)
    48 J
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The separation between the energy levels of a two-level atom is 2 eV ....
Suppose we have separation between the energy levels of a two-level atom is 2 eV.
4 × 1020 atoms are in the ground state and 7 × 1020 atoms are pumped into the excited state just before lasing starts.
Lets, say N1=4 × 1020, N2= 7× 1020.
Then,
N2 - N1 = 3 × 1020
We know that the energy of the laser pulse will be:

Applying the given data we have:
Energy of laser pulse, 
⇒ E = 48 J.
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Community Answer
The separation between the energy levels of a two-level atom is 2 eV ....
The separation between the energy levels of a two-level atom is 2 eV. Suppose that 4 photons are incident on the atom, each with an energy of 1 eV.

Since each photon has an energy of 1 eV and the separation between the energy levels of the atom is 2 eV, only 2 photons can be absorbed by the atom. The other 2 photons will not be absorbed because their energy does not match the energy level spacing of the atom.

Therefore, only 2 photons will be absorbed by the atom and the remaining 2 photons will continue to propagate without being absorbed.
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The separation between the energy levels of a two-level atom is 2 eV . Suppose that 4× 1020atoms are in the ground state and 7× 1020atoms are pumped into the excited state just before lasing starts. How much energy will be released in a single laser pulse?a)24.6 Jb)22.4 Jc)98 Jd)48 JCorrect answer is option 'D'. Can you explain this answer?
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The separation between the energy levels of a two-level atom is 2 eV . Suppose that 4× 1020atoms are in the ground state and 7× 1020atoms are pumped into the excited state just before lasing starts. How much energy will be released in a single laser pulse?a)24.6 Jb)22.4 Jc)98 Jd)48 JCorrect answer is option 'D'. Can you explain this answer? for UGC NET 2024 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about The separation between the energy levels of a two-level atom is 2 eV . Suppose that 4× 1020atoms are in the ground state and 7× 1020atoms are pumped into the excited state just before lasing starts. How much energy will be released in a single laser pulse?a)24.6 Jb)22.4 Jc)98 Jd)48 JCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UGC NET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The separation between the energy levels of a two-level atom is 2 eV . Suppose that 4× 1020atoms are in the ground state and 7× 1020atoms are pumped into the excited state just before lasing starts. How much energy will be released in a single laser pulse?a)24.6 Jb)22.4 Jc)98 Jd)48 JCorrect answer is option 'D'. Can you explain this answer?.
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