First slide

Hydrogen spectrum

Question

The frequency of emission line for any transition in positronium atom (consisting of a positron and an electron) is x times the frequency for the corresponding line in the case of H atom, where x is

Difficult

A

$\sqrt{2}$
B

$1 / 2 \sqrt{2}$
C

$2 \sqrt{2}$
D

$1 / 2$

Solution

Rydberg's constant determines the frequencies. We have $R \propto m$ so, modified R for positronium atom is half of H atom. Hence, frequencies are reduced to half.

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