Question

8. A radio active material decreases by
simultaneous emissions of two particles with hall
lifes 1620 and 810 years. The time after which 1/4
of the material remained is
1) 1080 years
2) 2000 years
3) 1500 years 4) 1200 years
13, A ta
Test disint
the energ
disintegra
deuteron

Answer 1

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