Question: Q. 8. The energy levels of a hypothetical atom are given below. Which of the shown transitions will result in the emission of photon of wavelength 275 nm ?

A] [OD South 2016]

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Solution:

Ans. (i) Energy of photon =hcλ

=6.64×1034×3×108275×109×1.6×1018eV =4.5eV1/2+1/2

(ii) The corresponding transition is B

[CBSE Marking Scheme 2016]

Detailed Answer :

Energy of a photon corresponding to wavelength λ,

E=hcλ =6.6×1034×3×108275×109 J1/2 =6.6×1034×3×108275×109×1.6×1019eV

(1)=6.6×3×102275×1.6 =4.5eV

(ii) the calculated energy of the photon matches with the transition B.



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