Instructions: For each of the following
situations, use the
sketch/scribble buttone
to draw what this graph
looks like.
3.
Distance
3 Return to your chair.
Walk in one direction
slowly for 2 seconds,
then speed 3 seconds
accelerating
4. Return to your chair.
Walk for 3 seconds in
one direction. Stop for
one second. Then walk
back toward your chair
for 3 seconds.
4.
Time
Distance
Be sure to enter your
answers

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.