11) Read the following paragraph. Then, answer the question. Johnny notices that when he runs up the stairs at school, he is short of breath and
very tired. He decides he wants to lose weight and get healthy. Johnny spends a
couple of days recording everything he eats and notices that he drinks soda three
times a day and only drinks water once a day. Johnny hypothesizes that if he stops
drinking soda, then he will lose weight. Johnny decides to only drink water for one
month and monitor his weight. Every week on Sunday morning, Johnny weighs
himself. After the first week, he lost four pounds. For each Sunday after that, he
continued to lose two pounds a week, losing a total of ten pounds.
What is the independent variable?

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.

the answer to this is proletariats.

hope this : )

the doppler effect is used by weather forecasters to measure 

moving clouds