Sam blew up a balloon and rubbed it on his head. then he stuck the balloon on the wall. this was all the result of electrostatics or the transfer of charge. the appearance of negative charge on a balloon is the result of its gaining electrons. and these electrons must come from somewhere; in this case, from sam's hair. electrons are transferred in any charging process. in the case of charging by friction, they are transferred between the two objects being rubbed together. prior to the charging, both objects are electrically neutral and the situation obeys the law of conservation of charge. how does the law of conservation of charge explain sam and his balloon? a) friction creates a charge that collected on the balloon. b) the balloon gained electrons; sam's hair gained protons. c) if the balloon acquires charge, sam's hair loses charge. d) the net charge before is zero; the net charge after is negative.

If the balloon acquires charge, Sam's hair loses charge.

Explanation:

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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.