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Energy levels A, B and C of a certain action corresponding to increasing values of energy i.e. E_A < E_B < E_C. If λ_1, λ_2 and λ_3 are wavelength of…

NEET UG 2005 — Physics Modern Physics

2005mcqhard

Energy levels A,B\mathrm{A}, \mathrm{B}A,B and C\mathrm{C}C of a certain action corresponding to increasing values of energy i.e. EA<EB<ECE_A < E_B < E_CEA​<EB​<EC​. If λ1\lambda_1λ1​, λ2\lambda_2λ2​ and λ3\lambda_3λ3​ are wavelength of radiations corresponding to transitions C\mathrm{C}C to B,B\mathrm{B}, \mathrm{B}B,B to A\mathrm{A}A and C\mathrm{C}C to A\mathrm{A}A respectively, which of the following relations is correct?

Official previous-year question

Held on 30 Apr 2005 · Verified 9 Jul 2026.

Options

  1. A

    λ3=λ1+λ2\lambda_3=\lambda_1+\lambda_2λ3​=λ1​+λ2​

  2. B

    λ3=λ1λ2λ1+λ2\lambda_3=\frac{\lambda_1 \lambda_2}{\lambda_1+\lambda_2}λ3​=λ1​+λ2​λ1​λ2​​

  3. C

    λ1+λ2+λ3=0\lambda_1+\lambda_2+\lambda_3=0λ1​+λ2​+λ3​=0

  4. D

    λ32=λ12+λ22\lambda_3^2=\lambda_1^2+\lambda_2^2λ32​=λ12​+λ22​

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