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When the transition takes place from En6 -> En5, what is the wavelength of produced beam?

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When the transition takes place from En6 -> En5, what is the wavelength of produced beam?

(a) 6328 Å

(b) 33913 Å

(c) 11523 Å

(d) 7550 Å

I had been asked this question during an internship interview.

I want to ask this question from Helium Neon Laser topic in division Laser of Engineering Physics II

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The correct answer is (b) 33913 Å

To elaborate: When the lasing transition is from En6 -> En5, it produces a beam of  33913 Å. The opper level is same in this case and in the 6328 Å transition.

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