The ratio of the 2 p → 1 s transition energy in He⁺to that in the H atom is closest to · ABC26PH0639

Subject: Physical Chemistry · Chapter: Atomic Structure · Topic: Atomic Structure – General · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Medium

The ratio of the $2 \mathrm{p} \rightarrow 1 \mathrm{s}$ transition energy in $\mathrm{He}^{+}$to that in the H atom is closest to

(a)1

(b)2

(c)4

(d)8

Answer

Answer: C ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

Hydrogen-like energies scale as Z²: the 2p→1s energy in He⁺ (Z = 2) is 4 times that in H.

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