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A small photographic plate is
exposed for 10 hours to a
radioactive substance. When
examined 300 dots are
counted. A second plate is
exposed for 2 ½ hours and
examined, you would expect
to find how many dots?
Show Answer
Answer for 5 Points
75 dots
Back to Board
A group of students did the
“decaying dice”
experiment the way you
did, except they considered
a die to have decayed if it
had a six or five on top.
How would the half-life
they found compare to the
one you found?
Show Answer
Answer for 5 Points
Their half-life is
shorter than yours.
Back to Board
During radioactive
decay, how is it possible
for a beta particle to be
emitted from a positively
charged nucleus?
Show Answer
Answer for 5 Points
A neutron decays into
a proton and electron.
Back to Board
What are charged electrons
emitted by some radioactive
elements?
Show Answer
Answer for 5 Points
Beta particles
Back to Board
In 1985, during the
construction of a skyscraper in
Austin, Texas, the remains of a
mastodon were unearthed. If
only 1/64 of the original
carbon-14 remained, and
carbon-14 has a half life of
5730 years, approximately how
old were the mastodon bones?
Show Answer
Answer for 5 Points
34,380 years
Back to Board
Describe what
occurs in fission.
Show Answer
Answer for 10 Points
A single nucleus divides into
two or more nuclei and gives
off energy.
Back to Board
Describe what occurs in
a fusion reaction.
Show Answer
Answer for 10 Points
Two low mass nuclei are
joined to form one nucleus
Back to Board
What are massive,
positively charged
particles emitted by
some radioactive
elements?
Show Answer
Answer for 10 Points
Alpha Particles
Back to Board
In 1992, the remains of a Saber
Tooth Tiger were unearthed. If
only 1/32 of the original carbon14 remained, and carbon-14 has a
half life of 5730 years,
approximately how old were the
Saber Tooth Tiger bones?
Show Answer
Answer for 10 Points
28,650 years
Back to Board
Using a Geiger counter students measured
background radiation. The Geiger counter
counted 2,025 counts in 75 minutes. What
was the background?
Show Answer
Answer for 10 Points
27.0 Counts/min
Back to Board
Given a radioactive sample, list
some ways how would you
reduce the counting rate of the
sample.
Show Answer
Answer for 15 Points
1.
Placing a metal sheet between the
sample and the counter
2.
3.
Reduce the mass of the sample
Increase the distance of the
sample and the counter
Back to Board
10 groups took background readings
with a Geiger counter in one-minute
intervals. The groups reported the
numbers counted as: 20,18, 22, 24, 19,
17, 21, 20, 19, and 23. If another group
were to take a measurement, what do
you think would have been the result?
Show Answer
Answer for 15 Points
Any number inbetween 24 and 17
would be most likely
however, the result
cannot be predicted
Back to Board
Why is radon a health risk to
us within closed spaces
like basements?
Show Answer
Answer for 15 Points
1.Radon can build up in basements from
the ground.
2.We breathe in and out several times a
minute.
3.Lungs are not lined with skin so it absorbs
more radiation.
Back to Board
A Geiger counter clicks an average of 11 times per
minute when no substance is placed near it. When
three samples were held one at a time at a fixed
distance from the counter, the counting rates were as
follows:
Substance
Counting rate (counts/min)
A
76
B
104
C
13
Form the data, which sample or samples would affect
a photographic plate?
Show Answer
Answer for 15 Points
Sample A and B only
Back to Board
Four lab groups made “compounds” using
fasteners and rings. Some made FsR, and some
made FsR2. Using the table below which groups
made FsR and which groups made FsR2?
Team
Mass of Fs
Mass of Product
1
20
40
2
8
12
3
16
32
4
16
24
Show Answer
Answer for 15 Points
FsR
FsR2
2 and 4
1 and 3
Back to Board
A group receive 32 g of fasteners (Fs) and
12 g of rings (R). They make 40 g of FsR,
using up all the fasteners. What is the
ratio of Mass of Fs to Mass of Rs in the
“compound” FsR?
Show Answer
Answer for 20 Points
Mass of F’s = 32 = 4
Mass of R 40-32
Back to Board
A radioactive sample at 20 C is placed near a
Geiger counter. The average counting rate
is found to be 1.0 x 102 counts per minute.
The temperature of the sample is then
raised to 100  C. What will the new average
counting rate be?
Show Answer
Answer for 20 Points
The average counting rate will remain
the same. The counter will still record
an average of about 1.0 x 102
counts/min because the intensity of
the radiation is independent of
temperature
Back to Board
What are the two most important differences
between the following reactions?
a. Water decomposing into hydrogen and oxygen
b. Polonium decomposes into lead and helium
Show Answer
Answer for 20 Points
Reaction a. we can control the rate and
we can put hydrogen and oxygen back
together to form water.
Reaction b. we cannot control the rate
of decay and the practical impossibility
of recombining lead and helium
together to form polonium.
Back to Board
A student measured the
radioactive background in two
locations. At location A, she
observed 50 counts in 2.0
minutes. At location B, she
observed 150 counts in 10
minutes. Which location had the
higher background?
Show Answer
Answer for 20 Points
Location A, had the
higher background at
25 counts/min
Back to Board
A lab group found the background in a
basement to be 15 counts/min and the
counting rate for the basement air
passed through a filter to be 176
counts/min. What should the group
report for the net counting rate on the
filter?
Show Answer
176-15= 161 counts/min
Back to Board
In what way is pulling a rod
from a black box similar to
heating baking soda in
Experiment 1.1?
Show Answer
Answer for 25 Points
Once you pulled a rod from a
black box, you could not put it
back. In heating baking soda,
you decomposed the baking
soda and you could not put it
back together.
Back to Board
If several bins of different sizes were
completely filled with the compound FsR,
which of the following would be the
same?
A. The number of rings in each bin
B. The number of rings and fasteners in
each bin
C. The percent by mass of rings in each bin
D. The percent by mass of fasteners in each
bin
Show Answer
Answer for 25 Points
C and D are both correct
responses because the ratio of
the mass of Fs or R to FsR is
independent of the size of the
sample of the “compound”
Back to Board
A.
B.
C.
D.
E.
Which of the following are parts of the
atomic model of matter, and which are
illustrations of the model?
Matter is made up of very tiny particles
Atoms of the same element are all alike
A rubber ring combines with a fastener
to form FsR
Atoms of different elements may
combine to form compounds
Marbles can be stacked in a box to
represent a solid
Show Answer
Answer for 25 Points
A, B, and D are parts of
the model. C and E are
only analogies used to
illustrate the model.
Back to Board
In an experiment to
determine the radioactive
background, a Geiger
counter detected 940
counts during 60.0 minutes.
What is the radioactive
background?
Show Answer
Answer for 25 Points
15.7 counts/min
Back to Board
What fraction of the initial number of
atoms of the radioactive element
remain after 30 minutes?
300
250
200
150
100
50
0
5
10
15
20
25
30
35
Show Answer
Answer for 25 Points
1/8
Back to Board
Authored by
Jeff Ertzberger - 2004
University of North Carolina at Wilmington
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