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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