Verified answer

Ответ:

N=1,7625*10¹⁶;

t=4,23*10¹⁷ c

Объяснение:

²³⁸U;

T=1.41*10¹⁷ c;

No=2*10⁴⁰;

t₁=T   N₁=0,5*No=0,705*10¹⁷

t₂=2T  N₂= N0,5*N₁=0,3525*10¹⁷

t₃=3T   N₃=0,5*N₂=1,7625*10¹⁶

t=3T=3*1.41*10¹⁷=4,23*10¹⁷ c