What is the frequency and wave-length of a photon emitted during a transition from the n = 5 state to the n = 2 state in the hydrogen atom.
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It's as mentioned in attachment
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Where = 2 and
= 5; this transition gives rise to a spectral line in the "Balmer series".
\Delta E\quad =\quad 4.58\quad \times \quad { 10 }^{ -19 }\quad J
We know,
Where, h = Planck's constant
Also,
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