Section 30.1
The Nucleus
Practice Test
1.
The atomic number is __________.
a.
the number of neutrons
b.
the number of electrons
c.
the number of particles
d.
the number of protons
Hint
2.
What is the relation between mass and energy?
a.
E
=
mc
2
b.
m
=
Ec
2
c.
E
=
m
/
c
d.
E
=
mc
Hint
3.
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.
-0.00696 u
b.
-0.032058 u
c.
-0.028398 u
d.
-0.029538 u
Hint
4.
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
5.
There are several carbon isotopes. Each one has the same number of _________.
a.
electrons
b.
neutrons
c.
protons
d.
particles
Hint
6.
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 isotopes.
d.
There are partial neutrons.
Hint
7.
What first started scientists looking for neutrons?
a.
neutral particle beams used in the lab
b.
atomic radiation
c.
the existence of electrons outside the nucleus
d.
the mass of the nucleus being larger than the mass of the protons
Hint
8.
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 is destroyed.
c.
It becomes binding mass.
d.
It becomes binding energy.
Hint
9.
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.
9.41 MeV
c.
2.41 MeV
d.
941 MeV
Hint
10.
What holds protons in the nucleus?
a.
gravity
b.
weak nuclear force
c.
electrical force
d.
strong nuclear force
Hint
11.
Which is a nucleon?
a.
an electron
b.
a positron
c.
a proton
d.
a beta particle
Hint
12.
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
13.
The phosphorus isotope
has a mass defect of '-0.282253 u. What is the binding energy?
a.
?-26.292 MeV
b.
?-765.92 MeV
c.
?-262.92 MeV
d.
?-212.62 MeV
Hint
14.
The strong nuclear force is ___________.
a.
stronger than the electromagnetic force, but has more range
b.
weaker than the electromagnetic force, but has more range
c.
stronger than the electromagnetic force, but has less range
d.
weaker than the electromagnetic force, but has less range
Hint
15.
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.
9.26×10
2
MeV
b.
?8.04×10
-1
MeV
c.
9.26 × 10
7
MeV
d.
8.04×10
2
MeV
Hint
