The Atomic Nucleus And Radioactivity : Question Preview (ID: 6280)


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Two common products of unbound neutron decay are
a) another neutron and an electron b) a proton and an electron c) an alpha particle and an electron d) a proton and a gamma ray
Which of the following is NOT emitted in radioactive decay
a) Alpha particles b) High-energy electromagnetic radiation c) Beta rays d) All of the choices are emitted
The atomic number of an atom or ion refers to the number of
a) neutrons b) protons c) nucleons d) electrons
The atomic mass number of an atom refers to the number of
a) neutrons b) protons c) nucleons d) electrons
A sample of a certain radioactive material has ahalf life of 1 year. How much of this radioactive material will be left at the end of 3 years?
a) All of it b) One half c) One quarter d) One eighth
When Uranium (92) ejects an alpha particle, the nucleus left behind has
a) 92 protons b) 91 protons c) 90 protons d) 89 protons
Wehn thorium (90) ejects a beta particle, the resulting nucleus has
a) 92 protons b) 91 protons c) 90 protons d) 89 protons
All elements beyond uranium in the periodic table
a) are found naturally in the earth b) do not exist c) have relatively short half lives d) have no isotopes
Carbon-14 to radioactive and decays into
a) carbon-12 b) carbon-13 c) oxygen-14 d) nitrogen-14
The half life of carbon 14 is 5730 years. Suppose a basket was found that contains one half as much carbon 14 as a new basket of the same material. what is the approximate age of
a) 5730 years b) 2865 years c) 1432 years d) 716 years
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