Air is contained in a variable-load piston–cylinder device equipped with a stirring paddle wheel. Ini-tially, air is at400kPa and17°C. The paddle wheel is now turned by a motor until75kJ/kg of workhas been transferred to air. Model the air as an ideal gas with constant specific heats and calculate theamount of heat transfer per unit mass that is needed to maintain a constant air temperature whileallowing the gas volume to triple.

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.

radiation warms things up temp rises convection currents air circ windy weather