Quiz21all
1) By what process does thorium-23O decay to radium-226
A) beta emission
B) alpha emission
C) gamma emission
D) positron emission
E) electron capture
2) In balancing
the nucleat reaction
A)Pu.
293 __
B)Np.
92
U+
234 p.
4
902* H". ah" identitv of element E is
D)Th.
C)U.
E)Pa.
3) This reaction is an example of
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.
A) positron decay
B) gamma emission
C) alpha decay
D) electron capture
E) beta decay
4) Bombardment of uranium-23S with a neutron generates tellurium-13S, 3 neutrons, and
A) krypton-103.
B) zirconium-98.
C) zirconium*99.
D) krypton-101.
E) strontium-99.
5)
131I has a half*life of 8.04 days. Assuming you start with a 1.53 mg sample o1 1311 how many mg will remain
?
after 13.0
E) 0.440
D) 0.258
c) 0.422
B) 0.499
A) 0.835
davs
5) The mass of a proton is1'.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect (in amu) of a
!|Co
n
r"fu*?
A) 0.5489
(The mass of a cobalt-60 nucleus is 59.9338 amu.)
c) 27.7830
B) 0.540s
7
D) 0.4827
E) 0.0662
whose
than those respectively of the original nucleus.
7) Alpha decay produces a new nucleus
A) atomic number is 2 more and mass number is 2 less
B) atomic number is 1 less and mass number is 2 less
C) atomic number is 2 less ard mass number is 4less
D) atomic number is 2 less and mass number is 2 less
E) atomic number is 2 more and rnass number is 4 more
8) The half-life for beta decay of strontium-9O is 28.8 years. A milk sample is found to contain 10.3 ppm
strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm?
E) 131
D) 0.112
c) 186
B) e2.3
A) 96.e
Consider the follmoing data for a particular rndionuclide:
9) What is the rate constant (in min-l) for the decay of this radionuclide?
c) 0.0242
B) M.64
A) A.A224
half-life (in min) of this radionuclide?
c) 0.0324
B) 3o.e
A) 0.0224
D) 30.e
E) 0.0324
D) M.64
E) 0.0242
10) lA/hat is the
11) The mass of a proton is 1,.673 * 1A-24 g. The mass of a neutron is1.675 10-24 g. The mass of the nucleus of an
"
56Fe ato* is 9.289 , 10-23 g. What is the nuclear binding energy (in for 56Fe? (c = 3.00 t08 m/s)
)
A) 2.57 * 10-15
B) 6.07 * 106
12) Carbon-l1 is used in medical imaging. The
sample remains after 60.0 min?
B) 34.0
A) 13.0
C)7.72' 10-8
D)7.72. 10-11
'
E) S.36
'
10-9
half-life of this radioisotope is 20.4 min. What percentage of a
c)
D) 5.28
2.94
E) 71.2
with 1.000 g of cobalt-60,0.675 g will remain after 3.00 yr. This means that the hal-f-life of cobalt-60
yr.
E) 2.03
D) 3.08
c) 5.30
B) 7.65
A) 4.M
L3) If we start
is
Carbon-11 decays by positron emission:
-
t-tc * 1]e.9u
b5r
The decay occurs with a release ot2.87 " 1011 I per mole of carbon-11. When 4.00 g of carbon-11 undergoes this
g of mass is converted to energy.
radioactive decay,
A) 8.62
'
1d
B) 1.15
'
10-6
C) 3.48
' 1d
D) 1.16
'
10-3
E) 1.28
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