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Question

Applying Bohr's model when H-atom comes from n=4 to n=2, calculate its wavelength. In this process, write whether energy is released or absorbed? Also write the range of radiation. RH=2.18×1018J,h=6.63×1034J.s.

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Solution

Energy is released in this process; and the radiation will belong to visible region (Balmer series).
E=hcλ=RHZ2[1n211n22]
1λ=RHZ2hc[1n211n22]
=2.18×1018×126.63×1034×3×108[14116]
=2.18×1018×126.63×1034×3×108[316]
λ=6.63×1034×3×108×163×2.18×1018=4866×1010m
=4866˚A.

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