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Ответ

Ответ дан
fisv

2. А=N/t=3,7*10¹²Бк

3. В

4.А

5. Б не відхиляється магнітним полем

6.D=E/m=2Гр

7. А3  Б4 В2  Г1

9. N-

N₀=640000

T=8000

t=24000

N=N₀*2(⁻t/T)

N=640000*2⁻³=80000

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