Physics · Modern Physics
Positronium is a short-lived bound state of an electron and a positron. The energy difference between the first excited state and the ground state of positronium is expected to be around:
- 1The same as that of the Hydrogen atom
- 2Half that of the Hydrogen atom✓
- 3Twice that of the Hydrogen atom
- 4Four times that of the Hydrogen atom
Correct answer
Half that of the Hydrogen atom
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