50pts many points

dr. trout has noticed that the salmon in his fish hatchery seem to enjoy listening to the radio when he has it on in the lab. the fish in the tank closest to the radio seem to grow larger. dr. trout decides that the more music he plays, the faster the fish must grow. to test his idea, he sets up 5 large ponds with 100 salmon in each pond. he places a loudspeaker at the middle of each pond and plays various amounts of music in each pond. he is careful to play the same band, feed the fish the same diet, and keep the water conditions in all tanks exactly the same. after 10 weeks, he ends the trial and takes the average weight of the fish in each pond, and organizes his data in the table. the dependent variable in dr. trout's experiment is

a) hours of music.
b) weight of the fish.
c) diet of the fish.
d) size of the ponds.

B) weight of the fish. I know this because Dr. Trout is not measure how much music they listen to nor the size of the ponds. He is measuring how big the fish get by the end of the 10 week period.

Explanation:

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

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.