Find the current through a person and identify the likely effect on her if she touches a 120 V AC source in the following circumstances. (Note that currents above 10 mA lead to involuntarily muscle contraction.) (a) Find the current (in mA) if she is standing on a rubber mat and offers a total resistance of 330 kΩ. mA Identify the likely effect. 1. She will experience muscle contraction for the duration of the shock. 2. She will feel nothing. (b) Find the current (in mA) if she is standing barefoot on wet grass and has a resistance of only 3600 kΩ. mA Identify the likely effect. 1. She will experience muscle contraction for the duration of the shock. 2. She will feel nothing.

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.

no simpler subs form complex ones. synthesise = make