Read the passage below. it summarizes survey information. the global youth tobacco survey asks youth to fill in the answers to several questions about their tobacco use. in this survey conducted between 2000 and 2007, it was found that in youth ages 13-15, 12 percent of boys and 7 percent of girls reported smoking cigarettes. this information was shared and reported on the american cancer society website. the information was then used by several industries in the fields of health care, insurance, and education. what is a reason that these data may be unreliable? it is information that is too old to be considered factual. it was found on the american cancer society website, and websites are unreliable. it is information that is used for a variety of purposes and not just gathered for research. it is from a self-reporting survey, and teens may not want to answer the questions honestly.

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.

cancer risk hope this

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.