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```				   The wavelength for n=3 to n=2 transition of the hydrogen atom is 656.3nm.what are the wavelnth for same transition of (a)positronium,which consist of an e- and a positron[positron is a +vely charged e-].(b)singly ionized He.pls answer immediately?pls
```

6 years ago

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### Answers : (1)

```										Dear student,
In case of positronium the wavelength will be same i.e 656.3 nm..

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