Alarge, 42.0 kg bell is hung from a wooden beam so it can swing back and forth with negligible friction. the bell's center of mass is 0.80 m below the pivot. the bell's moment of inertia about an axis at the pivot is 18.0 kg⋅m2. the clapper is a small, 1.8 kg mass attached to one end of a slender rod that has length l and negligible mass. the other end of the rod is attached to the inside of the bell; the rod can swing freely about the same axis as the bell. what should be the length l of the clapper rod for the bell to ring silently that is, for the period of oscillation for the bell to equal that of the clapper?

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

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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.