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Warriorz13:
What is the half-life of 99Tc if a 500 g sample decays to 62.5 g in 639,000 years?
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Warriorz13:
@JustSaiyan
JustSaiyan:
500 g ÷ 8 = 62.5 g 1/2^3 = 1/8 639,000 is 3 half-lifes 639,000 ÷ 3 =213000 half-life is 213000 years
JustSaiyan:
Got it?
Warriorz13:
Yea.. I'll probably still post the. Tho, also doing nuclear reactions.
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