Normal blood pressure for a human is 120/80 mmhg which is measured using a sphygmomanometer. this pressure is at the level of the human heart and assume for this problem that the heart is located at a distance of 3/4 the height of the human. if the height of the human is 1.75 m. a) calculate the pressures at the top of the head and at the bottom of the feet for a person standing on earth. b) what is change in the pressure distribution in the body if this person were standing on the surface of mars? comment on the results and implications on the person’s health.

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.