Cwblhewch y tabl isod.
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Cwblhewch y tabl isod.
| Hanner oes | Cysonyn dadfeiliad (s-1) |
|---|---|
| 53s | |
| blwyddyn | 3.2 x 10-10 |
| 12 blwyddyn | |
| diwrnod | 1.2 x 10-4 |
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