1.
A nucleon is which of the following?
- an electron
- a proton
- a neutron
- both a proton and a neutron
Exercises 7.4 Exercises
2.
Which nuclear radiation does not change in different nuclide?
- alpha
- beta
- gamma
- all of the above
3.
Who discovered the radioactivity?
- Rutherford
- Becquerel
- Pierre Curie
- Einstein
4.
Fiil in the blank below.
\begin{equation*}
{}_{2}^{4}He + {}_{7}^{14}N \rightarrow \cdots + {}_{1}^{1}H
\end{equation*}
- \(\displaystyle {}_{9}^{19}F\)
- \(\displaystyle {}_{8}^{17}O\)
- \(\displaystyle {}_{7}^{15}N\)
- \(\displaystyle {}_{6}^{12}C\)
5.
Fiil in the blank below.
\begin{equation*}
{}_{13}^{27}Al + {}_{2}^{4}He \rightarrow \cdots + {}_{0}^{1}n
\end{equation*}
6.
Write the following nuclides in isotopic notation (e.g., "\({}_6^{12}C \)")
- oxygen-14
- Copper-65
- Molebdenum-98
- Rubidium-100
7.
Find the number of neutrons in the following nuclei.
- \(\displaystyle {}_{13}^{27}Al\)
- \(\displaystyle {}_{94}^{239}Pu\)
- \(\displaystyle {}_{41}^{93}Nb\)
- \(\displaystyle {}_{43}^{99}Tc\)
8.
How much of the radiactive substance decays in 3 months if its half-life is 1 month.
9.
How much mass of 40 mg of a substance will remain after 24 days, if its half -life is 24 days?
10.
Which of the following statements about half-life is correct?
- Half-life is the time required for a substance to decay completely.
- Half-life is the time required for a substance to lose half of its initial mass.
- Half-life is the time required for a substance to reach its maximum concentration.
- Half-life is the time required for a substance to react with half of its initial concentration.
