Mae 238 U gyda hanner oes o 4.47 x 10 9 o flynyddoedd. Sawl niwclews 238 U sy...
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Mae 238U gyda hanner oes o 4.47 x 109 o flynyddoedd. Sawl niwclews 238U sydd ei angen er mwyn cael actifedd o 5000Bq?
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