JEE Main · 2005 · 08 May 2005 · Offline · Modern Physics

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The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

(A)III✓ Correct
(B)IV
(C)I
(D)II

Answer: (A)

Solution

The energy of an emitted photon equals the gap between the two levels of the transition, so the most energetic photon comes from the transition with the largest downward step in energy. Among the arrows drawn, transition III spans the greatest energy difference, so it is the one that emits the photon of most energy.

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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