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The given diagram indicates the energy levels of certain atom. When electron moves from 2E level to E level, a photon of wave length ‘ $λ$ ’ is emitted. The wave length of photon emitted during its transition from $\frac{4 E}{3}$ level to E level is

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$\frac{λ}{3}$

$\frac{3 λ}{4}$

$\frac{4 λ}{3}$

$3 λ$

answer is D.

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Detailed Solution

Electron transition from 2E level to E level
$Δ E = 2 E - E = E \to$ wave length ‘ $λ$ ’
(ii) Electron transition from 4E/3 level to E level
$Δ E = \frac{4 E}{3} - E = \frac{E}{3}$
$∴$ wave length $\to 3 λ$ $∵ E \propto \frac{1}{λ}$

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