Lead-207 can change into Lead-208.
When Lead-207 is bombarded with neutrons, the atom acquires the neutron. Adding a neutron only changes the mass number of the atom. This does not involve change in the identity of the atom. So, Lead-207 can change into Lead-208 without change in its chemical properties.
C. 10 m/s
You divide 1000 m by 100 s.
1000/100 to find the velocity
High school???
No way
It's work.
Answer
when there are ten they don't grow so well but when there is less than 10 they tend to grow