Section 30.1
The Nucleus
Practice Test
1.
What is the mass of the heaviest isotope shown in Figure 30-1?
a.
1.67×10
-27
kg
b.
8.35×10
-27
kg
c.
3.34×10
-27
kg
d.
6.68×10
-27
kg
Hint
2.
What is the mass defect?
a.
the difference in masses of different isotopes
b.
the difference between the sum of the individual masses of the nucleons and the mass of the nucleus
c.
the difference in mass between protons and neutrons
d.
the difference in mass between protons and electrons
Hint
3.
The atomic number is __________.
a.
the number of neutrons
b.
the number of particles
c.
the number of electrons
d.
the number of protons
Hint
4.
What happens to some of the mass of two protons and two neutrons when they form a helium nucleus?
a.
It disappears completely.
b.
It becomes binding energy.
c.
It becomes binding mass.
d.
It is destroyed.
Hint
5.
Why isn't the mass of argon (39.948 u) a whole number?
a.
The mass of the electrons must be considered.
b.
There are partial protons.
c.
There are partial neutrons.
d.
There are isotopes.
Hint
6.
What is the energy equivalent of a neutron (
m
= 1.673×10
-27
kg; 1 eV = 1.60×10
-19
J)?
a.
241 MeV
b.
941 MeV
c.
9.41 MeV
d.
2.41 MeV
Hint
7.
What is the relation between mass and energy?
a.
E
=
mc
b.
m
=
Ec
2
c.
E
=
mc
2
d.
E
=
m
/
c
Hint
8.
What holds protons in the nucleus?
a.
weak nuclear force
b.
strong nuclear force
c.
electrical force
d.
gravity
Hint
9.
The strong nuclear force is ___________.
a.
weaker than the electromagnetic force, but has more range
b.
weaker than the electromagnetic force, but has less range
c.
stronger than the electromagnetic force, but has more range
d.
stronger than the electromagnetic force, but has less range
Hint
10.
Calculate the mass defect of
(4.02602 u). The mass of a proton is 1.007825 u and the mass of a neutron is 1.008665 u.
a.
-0.032058 u
b.
-0.00696 u
c.
-0.029538 u
d.
-0.028398 u
Hint
11.
There are several carbon isotopes. Each one has the same number of _________.
a.
protons
b.
neutrons
c.
particles
d.
electrons
Hint
12.
How much energy is released in a reaction that has a mass defect of 8.63×10
-4
u? (1 u = 931.49 MeV.)
a.
8.04×10
2
MeV
b.
?8.04×10
-1
MeV
c.
9.26 × 10
7
MeV
d.
9.26×10
2
MeV
Hint
13.
What first started scientists looking for neutrons?
a.
the existence of electrons outside the nucleus
b.
the mass of the nucleus being larger than the mass of the protons
c.
neutral particle beams used in the lab
d.
atomic radiation
Hint
14.
Which is a nucleon?
a.
a positron
b.
a proton
c.
a beta particle
d.
an electron
Hint
15.
The phosphorus isotope
has a mass defect of '-0.282253 u. What is the binding energy?
a.
?-212.62 MeV
b.
?-765.92 MeV
c.
?-262.92 MeV
d.
?-26.292 MeV
Hint
