Nuclear Physics
Practice Test
1.
An electron has a de Broglie wavelength of 750 nm. Find the velocity of the electron.
a.
6600 m/s
b.
180 m/s
c.
970 m/s
d.
9700 m/s
Hint
2.
In Figure 29-3, what should be the overall direction of the electron drift?
a.
left
b.
right
c.
down
d.
up
Hint
3.
What does an antineutrino carry?
a.
charge and energy
b.
sound and momentum
c.
mass and charge
d.
momentum and energy
Hint
4.
What causes a pulse of current to travel from a Geiger-Mueller tube?
a.
atoms ionizing gas
b.
neutrons ionizing gas
c.
a charged particle or a gamma ray ionizing gas
d.
X rays
Hint
5.
A hydrogen atom has its electron in the
n
= 2 level. A photon with a wavelength of 297 nm strikes the atom and ionizes it. Assuming that the electron receives the excess energy from the ionization, what will be the kinetic energy of the electron in joules?
a.
4.27×10
-19
J
b.
3.18×10
-19
J
c.
1.26×10
-19
J
d.
6.69×10
-19
J
Hint
6.
An electron is accelerated by a potential difference of 120 V. What is the speed of the electron?
a.
2.7×10[supersctip 6 m/s
b.
6.5×10
6
m/s
c.
7.1×10
6
m/s
d.
5.9×10
6
m/s
Hint
7.
The __________ is the region in which there is a high probability of finding an electron.
a.
electron radius
b.
emission region
c.
electron cloud
d.
quantum model
Hint
8.
What happens to some of the mass of two protons and two neutrons when they form a helium nucleus?
a.
It is destroyed.
b.
It becomes binding energy.
c.
It becomes binding mass.
d.
It disappears completely.
Hint
9.
The __________ is the set of wavelengths at which a cool gas will absorb light.
a.
emission spectrum
b.
absorption spectrum
c.
photon emission
d.
composition spectrum
Hint
10.
In Figure 29-20, what resistor should be used to increase the current to 25 mA? Assume that the potential drop across the LED is still 1.2 V.
a.
192 Ω
b.
300 Ω
c.
240 Ω
d.
120 Ω
Hint
11.
Energy carried in the form of electromagnetic waves is frequently called __________.
a.
oscillating rays
b.
electromotive force
c.
terminal energy
d.
electromagnetic radiation
Hint
12.
An
n
-type semiconductor conducts electricity with __________.
a.
electrons
b.
neutrons
c.
holes
d.
protons
Hint
13.
The work function for a certain element is 2.87 eV. What is its threshold wavelength?
hc
= 1240 eV·nm
a.
446 m
b.
356 nm
c.
432 nm
d.
495 nm
Hint
14.
If the diode connected to ammeter A
2
in Figure 29-22 were reversed, what would happen to A
1
's reading?
a.
It would read zero.
b.
It would remain unchanged.
c.
It would increase.
d.
It would decrease to a non-zero value.
Hint
15.
Which of the following medical examination tools does not use radiation?
a.
PET scans
b.
radioactive tracing
c.
ultrasound
d.
X rays
Hint
16.
According to Figure 27-6, what is the approximate frequency needed to eject an electron with a minimum kinetic energy of 2 eV?
a.
10×10
14
Hz
b.
9.2×10
14
Hz
c.
4.5×10
14
Hz
d.
8.1×10
14
Hz
Hint
17.
_________ is the study of the properties of matter using its wave properties.
a.
Electromagnetism
b.
Wave dynamics
c.
Quantum mechanics
d.
Thermodynamics
Hint
18.
There are several carbon isotopes. Each one has the same number of _________.
a.
electrons
b.
neutrons
c.
protons
d.
particles
Hint
19.
Combined electric and magnetic fields that move through space are called __________.
a.
electromagnetic waves
b.
radiation waves
c.
piezoelectric fields
d.
oscillating fields
Hint
20.
Based only on the information from Figure 30-5 and Table 30-2, which of the following would be the best choice to inject for a PET scan?
a.
polonium 194
b.
polonium 210
c.
uranium 235
d.
lead 212
Hint
