The ratio of the loudness of lana’s earphones to the loudness of polina’s earphones to the loudness of goffy’s earphones is 6: 5: 3. if polina’s earphones have a loudness of 420 decibels, find the total loudness of all three earphones.

Total loudness of earphones will be 11176 decibels

Explanation:

We have given the ratio of loudness of earphones of Lana's , Polina's and Goffy's are 6:5:3

Let the loudness is multiple of x

So ratio will become 6x:5x:3x

So total = 6x+5x+3x = 14x

As it is given Polina's earphone loudness is 420 decibels

So

x = 84 decibels

So total loudness of earphones will be = 14×84 = 1176 decibels  

4

explanation:

4

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.