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Q.

What is the longest wavelength of singly ionized Helium atom in the ground state, that it will absorb strongly?

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a

54.4 nm

b

30.4 nm

c

40.5 nm

d

22.8 nm

answer is D.

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Detailed Solution

1λ=z2R1n2−1m2for ground to infinityλ=1z2R=9124=228 A0=22.8 nm
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What is the longest wavelength of singly ionized Helium atom in the ground state, that it will absorb strongly?