| 1. |
A particle with a +2 charge which is produced during the decay of a radioactive element is:
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a)
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a proton.
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b)
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a deuteron.
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c)
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a positron.
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d)
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an alpha particle
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e)
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a beta particle.
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| 2. |
An atom with 15 protons and 18 neutrons would be an isotope of:
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a)
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arsenic
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b)
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phosphorus
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c)
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argon
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d)
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sulfur
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e)
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chlorine
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| 3. |
What is the mass defect for  ?
Masses: = 11.0216; proton = 1.0073; neutron =
1.0087; electron = 0.00055 amu.
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a)
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1.685 amu
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b)
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0.1707 amu
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c)
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0.1055 amu
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d)
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0.0707 amu
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e)
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0.0055 amu
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| 4. |
A positron has the same mass as:
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a)
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a gamma ray.
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b)
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a neutron.
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c)
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an alpha particle.
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d)
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a proton.
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e)
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a beta particle.
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| 5. |
 can
be prepared by electron capture from:
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a)
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b)
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c)
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d)
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e)
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| 6. |
In the ejection of a beta particle from the nucleus, the following occurs.
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a)
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A positron is converted to a neutron.
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b)
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A neutron is converted to a positron.
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c)
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A neutron is converted to a proton.
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d)
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A proton is converted to a neutron.
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e)
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A neutron is converted into an electron.
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| 7. |
Among the following nuclides, the highest nuclear binding energy per nucleon is found for:
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a)
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b)
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c)
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d)
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e)
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| 8. |
The most likely mode of decay for  is:
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a)
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alpha emission.
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b)
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beta emission.
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c)
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positron emission.
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d)
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gamma radiation.
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e)
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a neutron emission.
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| 9. |
Of the following nuclides, the one most likely to be radioactive is:
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a)
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b)
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c)
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d)
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e)
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| 10. |
The half-life of the radioisotope  is 1.0 hr. The decay of a 160-g sample of
the isotope to 1.25 grams requires:
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a)
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3.0 hr.
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b)
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4.0 hr.
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c)
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5.0 hr.
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d)
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6.0 hr.
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e)
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7.0 hr.
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| 11. |
The nuclear bombardment reaction
 +    + 
is represented by:
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a)
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b)
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c)
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d)
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e)
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| 12. |
The most probable mode of decay for  is:
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a)
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alpha emission.
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b)
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beta emission.
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c)
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positron emission.
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d)
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neutron emission.
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e)
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gamma emission.
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| 13. |
When  undergoes an electron capture, what is the
immediate nuclear product?
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a)
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b)
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c)
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d)
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e)
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| 14. |
A living tree contains  (half-life 5600 years) and has a specific activity
of 750 counts per hour. A wooden artifact from archeological site gives a count of 90
counts per hour. The age of this artifact is most nearly:
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a)
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5600 years.
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b)
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11,000 years.
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c)
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17,000 years.
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d)
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22,000 years.
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e)
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47,000 years.
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| 15. |
When  undergoes neutron emission, what is the immediate
nuclear product?
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a)
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b)
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c)
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d)
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e)
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| 16. |
When  undergoes positron emission, what is the
immediate nuclear product?
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a)
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b)
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c)
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d)
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e)
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| 17. |
As a radioactive isotope decays, its half-life:
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a)
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doubles.
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b)
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halves.
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c)
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decreases.
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d)
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increases.
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e)
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remains the same.
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| 18. |
The isotope  has a half-life of 22 years. What percentage of
a pure sample prepared in April 1937 remains in April 1993?
and 
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a)
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38%
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b)
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31%
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c)
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26%
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d)
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21%
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e)
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17%
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| 19. |
What is the decay constant for iodine-131, which is used to traet cancer of the thyroid. It decays by beta emission with a half-life of 8.05 days.
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a)
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8.35 x 10-2 day-1
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b)
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1.59 x 10-3 hr-1
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c)
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3.97 x 103 hr-1
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d)
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5.98 x 10-5 min-1
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e)
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1.43 x 10-6 sec-1
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| 20. |
A 4.50-mg sample of a newly discovered isotope was analyzed and found to contain only 3.25 mg after a period of 29.6 hours. What is the half-life of the isotope?
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a)
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47.6 hr
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b)
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53.4 hr
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c)
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58.0 hr
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d)
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63.0 hr
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e)
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71.2 hr
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| 21. |
Strontium-90 is produced in nuclear explosions. It can replace calcium in the bones. The half-life of Sr-90 is 27.7 years. What is the rate constant for the decay of Sr-90?
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a)
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0.0125 yr-1
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b)
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0.0250 yr-1
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c)
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0.0375 yr-1
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d)
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0.0425 yr-1
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e)
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0.0450 yr-1
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| 22. |
If the activity of Strontium-90 in the bones of an exposed person was 90 dps, how long will it take the activity (in disintegrations per second) to decrease to 3.5 dps?
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a)
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50 yr
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b)
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65 yr
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c)
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70yr
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d)
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95 yr
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e)
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130 yr
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| 23. |
What is the rate constant of decay for Cobalt-60, which has a ha;f-life of 5.27 years?
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a)
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0.113 yr
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b)
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0.161 yr
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c)
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3.59 x 10-4 day-1
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d)
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7.18 x 10-3 hr-1
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e)
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25.8 sec-1
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| 24. |
The half-life of Phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?
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a)
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16 g
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b)
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8 g
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c)
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4 g
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d)
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2 g
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e)
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1 g
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| 25. |
What is the binding energy per nucleon, in joules, of a chlorine-35 atom, given that the atomic mass equals 34.9595 amu?
(e-1 mass = 0.00055 amu; n mass = 1.00867 amu; p mass = 1.00728 amu;
c = 3.00 x 108 m/s; 1 amu = 1.6606 x 10-24 g.)
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a)
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1.41 x 10-12 J/nucleon
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b)
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4.93 x 10-11 J/nucleon
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c)
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1.56 x 10-12 J/nucleon
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d)
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1.56 x 10-11 J/nucleon
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e)
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1.56 x 10-10 J/nucleon
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