9trumpet players blast the same note with the same intensity for as long as possible. after a period of time, 3 trumpet players exhaust their breath and stop playing; the loudness of the remaining trumpet players is decreased by: hint: the sound intensity is decreased by a factor of 3 after 3 of the 9 trumpet players cease playing. hint: inplayers = (nl oneplayer note: log(ab) = log(a) + log(b). a. 33db b. 30db c. 15db d. 8.3db e. 1.7db

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.

its a 5.5 n

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