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Worksheets6.1 Radioactive decay
Total questions: 15
Worksheet time: 8mins
Diagram shows a series of radioactive decays for the nucleus of uranium-238 to nucleus of radium-226.
What is the number of the alpha particles and beta particles emitted during this process?
Alpha : 2, Beta : 3
Alpha : 3, Beta : 2
Alpha : 4, Beta : 1
Alpha : 1, Beta : 1
Which of the following is a fusion reaction?
A
B
C
D
Which nuclei are isotopes of the same element?
X and Y only
X and Z only
Y and Z only
X, Y and Z only
Number of neutron in the element is
89
138
227
136
25 % of Gallium-65 atoms have decayed after 15 minutes. What is the half-life of Gallium-65?
30.0 minutes
23.4 minutes
15.0 minutes
7.5 minutes
A chain reaction takes place because
U is highly radioactive
the two nuclei Sr and Xe are still radioactive
the number of neutrons released is continuously multiplying as time increases
the energy released during the nuclear reaction is very high
The half-life of a radioisotope is 5 years. After 25 years, the mass of the undecay isotope remaining in a sample is 60 g. What was the initial mass of the isotope in the sample ?
120 g
300 g
600 g
1920 g
Which of the following shows the type of ray S and ray T?
S : Alpha , T : Beta
S : Gamma , T : Beta
S : Beta , T : Gamma
S : Gamma , T : Alpha
Diagram shows a decay graph when radioisotope X decays to element Y. Initially the mass of X is 40 g.
Determine the mass of X and the mass of Y in the sample after 30 hours.
X : 5 g , Y : 35 g
X : 10 g , Y : 30 g
X : 20 g , Y : 20 g
X : 30 g , Y : 10 g
The thick tracks of alpha particles in a cloud chamber shows that alpha particles have
high penetrating power
high ionising power
large mass
high speed
Diagram shows how the thickness of a sheet of paper is standardized. This process uses beta rays because it
has a long half-life
will sterilise the paper
can penetrate the paper
makes the paper shiny
The half life of arsenic is 18 days. A sample contains a certain amount of arsenic. After 72 days, only 10 g of arsenic still remains. What is the initial mass of the arsenic?
72 g
80 g
90 g
160 g
What type of radiation is emitted when a neutron is converted into a proton?
Alpha radiation
Beta radiation
X-ray radiation
Gamma radiation
In a radioactive decay series, if element A decays to element B and then to element C, which of the following statements is true?
A is more stable than B
A is less stable than C
B is more stable than C
B and C are isotopes of A
The activity of sample X becomes 6.25% of its original value after 120 minutes. What is its half-life?
30 minutes
40 minutes
60 minutes
80 minutes
