Предмет: Физика, автор: apietrov

Какой изотоп образуется из Th232 90 после четырех α-распадов и двух β-распадов?

Ответы

Автор ответа: dianamelnychuk

0

Альфа розпад, это сверху -4 снизу -2
B розпад, это сверху 0, снизу +1
Тh 216 82

Автор ответа: ProstoiLis

2

По закону сохранения массового числа
232=А+4*4+2*0
А=216
90=Z+4*2-2
Z=84
Po216 84 - изотоп полония

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Вопрос 1
Paul Miller is a journalist, so you would think that he would find it pretty difficult to give up using the internet for a year. (1) …..... , that’s exactly what he decided to do.

Выберите один ответ:
a.Instead
b.Although
c.Despite
d.However

Вопрос 2
It’s not that Paul didn’t (2) …..... going online. In fact, he found he was spending a large part of his day glued to the screen.
Выберите один ответ:

a.wish
b.like
c.want
d.satisfy

Вопрос 3
He felt that he had become too (3) …..... on it for everything.

Выберите один ответ:
a.dependent
b.influenced
c.reliable
d.self-confident

Вопрос 4
Like many of us, Paul couldn’t imagine (4) …..... the internet for a full day, not checking his emails and his Twitter account.

Выберите один ответ:
а.trying out
b.giving up
c.going ahead
d.getting on

Вопрос 5
Ответ сохранен
How on earth would he cope (5) ...….. being offline for a whole year?
Выберите один ответ:
a.over
b.with
c.for
d.along

Вопрос 6
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Выберите один ответ:
a.arrived
b.reached
c.come
d.got

Вопрос 7
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Выберите один ответ:
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a.except
b.otherwise
c.rather
d.unless

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