Предмет: Физика, автор: nikitaaz

При радиоактивном распаде некоторого элемента спустя промежуток времени, равный двум периодам полураспада данного элемента, доля распавшихся частиц от их первоначального числа составит?

1. 25%

2. 50%

3. 67%

4. 75%

5. 100%

Ответы

Автор ответа: helpme58

смотри .......................................................................

Приложения:

Автор ответа: Artem112

После полураспада половина частиц распадается, половина соответсвенно остается.

После первого полураспада распадется а*(1/2)=а/2

После второго полураспада распадется (а/2)*(1/2)=а/4

Всего распалось а/2+а/4=3а/4

Это составляет (3а/4)/а=3/4 части от первоначального

3/4=0,75=75%

Ответ: 4. 75%

Приложения:

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