• Atomic 1 0 4 0 6
• Atomic 1/27
• Atomic 1 0 4 0 1

Chapter30 Sample Multiple Choice Problems

1.The atomicmass unit is defined as

a.the mass of a proton.

b.the mass of an electron.

c.the mass of a hydrogen-1 atom.

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d.one twelfth the mass of a carbon-12 atom.

2.An elementwith atomic mass number of 14 and atomic number 6 has how many neutrons?

a.6

b.8

c.14

d.20

3.Isotopes of anelement have nuclei with

a.the same number of protons, but differentnumbers of neutrons.

b.the same number of protons, and the samenumber of neutrons.

c.a different number of protons, and adifferent number of neutrons.

d.a different number of protons, and thesame number of neutrons.

4.If an atom'satomic number is given by Z, its atomic mass by A, and its neutron number

by N, whichof the following is correct?

a.N = A + Z

b.N = Z - A

c.N = A - Z

d.None of the above is correct.

5. In a {93/41}Nbnucleus, the number of protons, neutrons, and electrons is

a.41, 52, 93

b.41, 52, 52

c.41, 52, 41

d.41, 52, 0

6.The bindingenergy per nucleon

a.increases steadily as we go to heavierelements.

b.decreases steadily as we go to heavierelements.

c.is approximately constant throughout theperiodic table, except for very light nuclei.

d.has a maximum near iron in the periodictable.

7.An alpha particleis also known as

a.an electron.

b.a positron.

c.a helium nucleus.

d.a photon.

8.A beta^- particleis also known as

a.an electron.

b.a positron.

c.a helium nucleus.

d.a photon.

9.The existenceof the neutrino was postulated in order to explain

a.alpha decay.

b.gamma emission.

c.beta decay.

d.fission.

10.When an alphaparticle is emitted from an unstable nucleus, the atomic mass number

of thenucleus

Atomic 1 0 4 0 6

a.increases by 2.

b.decreases by 2.

c.increases by 4.

d.decreases by 4.

e.none of the above.

11.If 4.0X10¹⁸atoms decay with a half-life of 2.3 years, how many are remaining

after 3.7years?

a.2.5X10¹⁸

b.1.7X10¹⁸

c.1.3X10¹⁸

d.1.1X10¹⁸

12.A radioactivesample has a half-life of 5.0 min.Whatfraction of the sample is left

after 20min?

a.1/2

b.1/4

c.1/8

d.1/16

13.The half-lifeof radioactive iodine-137 is 8.0 days.How many iodine nuclei are

necessary to produce an activity of 1.0 micro-Ci?

a.2.9X10⁹

b.4.6X10⁹

c.3.7X10¹⁰

d.7.6X10¹²

14.What happens tothe half-life of a radioactive substance as it decays?

a.It remains constant.

Atomic 1/27

b.It increases.

c.It decreases.

d.It could do any of these.

15.The mass of {90/38}Sr is 89.907737 u and the mass of theatom its beta decays to is
89.907151 u. What is the energyreleased in the decay?

a. 1.2 MeV

b. 112 keV

c.0.546 MeV

d.1.8 MeV

Answers:

1.d

2.b

3.a

4.c

5.d

6.d

7.c

8.a

Atomic 1 0 4 0 1

9.c

10.d

11.c

12.d

13.c

14.a

15.c