1. All of the naturally occurring radioactive decay series end when the radioactive elements have decayed to
bismuth (Bi)
hydrogen (H)
lead (Pb)
uranium (U)
answer: Uranium (U)
2. This type of radiation can easily pass through a human.
gamma
ultra-violet
beta
alpha
answer: gamma
3. This type of radiation is really the nucleus of a helium atom.
alpha
gamma
beta
proton
answer: alpha
4. As the size of nuclei increases, the ratio of neutrons to protons in the band of stability increases to
3 to 1
1.25 to 1
2 to 1
1.5 to 1
answer: 1.5 to 1
Ok except for #1. U is a radioactive element, naturally. There is a series for U-238, another series for U-235, and a third for Th-232. All end in Pb.
please need help thanks alot!!!!
Thanks DrBob222!
Mike--If you have a question, go to the top of the page and click on Post a New Question. Then type in your question and submit it. Someone will review it for you.
To answer the first question, one needs to understand the concept of the radioactive decay series. The natural radioactive decay series involves a sequence of radioactive decays, starting from a parent isotope and ending with a stable daughter isotope. In this case, the series ends when the radioactive elements have decayed to a stable isotope. Among the options given (bismuth, hydrogen, lead, and uranium), only uranium is a radioactive element. Therefore, the correct answer is uranium (U).
For the second question, one must have knowledge about the different types of radiation. Gamma radiation is a high-energy electromagnetic wave that can easily pass through a human body due to its penetrating power. Therefore, the correct answer is gamma.
Regarding the third question, understanding the concept of radiation and the nucleus of an atom is essential. Alpha particles are essentially the nuclei of helium atoms, consisting of two protons and two neutrons. Therefore, the correct answer is alpha radiation.
Moving on to the fourth question, the phrase "ratio of neutrons to protons in the band of stability" refers to the stable range of neutron-to-proton ratios for atomic nuclei. As the size of nuclei increases, the ratio of neutrons to protons in the band of stability increases to maintain stability. Among the options (3 to 1, 1.25 to 1, 2 to 1, and 1.5 to 1), the correct answer is 1.5 to 1.