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Quantum and Nuclear Review
Quantum and Nuclear Review
50 terms
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A review of quantum and nuclear physics
Flashcards
50 cards
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Practice quiz
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Host live
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Questions
50
Answers
1
Visible light wavelengths range from approximately 400 to 700 nm.
FALSE
TRUE
2
An electron orbits a proton in n=3 state. How many deBroglie wavelengths fit in this orbit?
9
12
3
6
3
Which of the following formulas can be used to determine the deBroglie wavelength?
λ = h/(mv)
λ = mc/h
λ = hmv
λ = mv/h
4
A photon scatters when it hits an electron. Which deflection angle gives the biggest λ increase
90 degrees
0 degrees
180 degrees
60 degrees
5
400 grams of a radioactive element has a half-life of 2 hours. How much remains after 6 hours.
50 g
200 g
25 g
100 g
6
Using this graph of V
stopping
(or KE
max
) vs. photon frequency, find the material work function.
1.0 V
0.5 V
1.5 V
0.25 V
7
Known as the “father of the atomic bomb” for his role in the Manhattan Project
Oppenheimer
Pauli
deBroglie
Bohr
8
If the energy of an object is similar to the energy of a photon, use this model of light...
Bohr
wave
Rutherford
particle
9
A beta - particle looks like a
proton
helium nucleus
electron
neutron
10
How does the momentum of a photon change if the wavelength is halved?
stays the same
quadruples
doubles
is cut in half
11
When an electron collides with a positron they produce photons. This phenomenon is called...
annihilation
compton scattering
neutron diffraction
pair production
12
The atomic number tells the number of
neutrons in the atom
nucleons in the atom
electrons in the atom
protons in the atom
13
Isotope means...
same number of protons
same number of protons and neutrons
same number of neutrons
same atomic mass number
14
Which listed term describes this equation?
alpha decay
exothermic
endothermic
gamma decay
15
Which of the following photons has the greatest energy?
x-ray
infrared
ultraviolet
blue
16
How many nucleons are in this atom?
35
13
24
11
17
Why do lighter nuclei have a lower neutron to proton ratio than heavier nuclei?
Weak nuclear force is higher.
Weak nuclear force is lower.
More neutrons in heavy nuclei give more strong nuclear force
Fewer neutrons provide greater electromagnetic force.
18
If the size of an object is similar to the wavelength of light, use this model of light...
Bohr
wave
Rutherford
particle
19
Which of the following is the formula of the photon momentum?
p = E/(mc)
p = cλ/h
p = hc/f
p = hf/c
20
If all of these objects move at the same speed, which has the greatest deBroglie wavelength?
neutron
alpha particle
electron
bowling ball
21
A gamma ray looks like a
photon
helium nucleus
proton
positron
22
In Rutherford's experiment, most alpha particles are not deflected. What is explained by this?
an atom is mostly empty space
electrons move around the nucleus in orbits
an atom's + charge is concentrated in the nucleus
the nucleus is made of protons and neutrons
23
When nucleons combine to form a stable nucleus, binding energy is:
detroyed and becomes nothing
created from nothing
released and becomes energy
released and becomes visible light
24
A temperature of 20
o
C doubles. The new temperature is 40
o
C.
TRUE
FALSE
25
Which of the following formulas expresses the photoelectric effect?
E = hf
hf=W₀+KE
velocity = frequency x wavelength
E = mc2
26
A quanta of light is also known as a
electron
bubble
proton
photon
27
Binding energy is the amount of energy...
to break a nucleus into protons and neutrons
to break a nucleus into protons and electrons
released when electrons change energy levels
to break a nucleus into electrons and neutrons
28
What is this process?
fission
alpha decay
beta decay
fusion
29
A beta + particle looks like a
proton
positron
electron
neutron
30
In the element symbol, what is the name of the index A?
atomic mass number
principle quantum number
atomic number
magnetic quantum number
31
All of the following are properties of gamma rays except
they ionize gases
they are deflected by magnetic fields
they penetrate objects
they discharge electrified objects
32
Polish-born physicist who won two Nobel prizes; discovered polonium and radium
Bohr
Curie
Feynman
Pauli
33
Two slits allowing electrons to go through create this type of pattern on a screen...
reflection
rectilinear
interference
refraction
34
Which of the following provides the best evidence that light can have particle properties?
electron diffraction
gamma ray diffraction
diffraction of light
photoelectric effect
35
Developed diagrams to show the behavior of subatomic particles; “greatest mind since Einstein”
Fermi
Feynman
Heisenberg
Curie
36
Which of the following colors indicates an object of the highest energy?
violet
red
blue
yellow
37
Young thought that light was a wave.
TRUE
FALSE
38
Which is a property of a black body radiator?
It absorbs radiation but does not re-emit radiation.
It is always black, even when heated to high temperatures.
It absorbs radiation, then re-emits according to temperature
As it is heated, it changes color from black to blue to red.
39
The mass of an atom is...
evenly distributed between protons, neutrons, and electrons
evenly distributed between nucleons and electrons
evenly distributed between protons and electrons
concentrated in the nucleus
40
Heavier nuclei have a greater ratio of neutrons to protons than lighter nuclei.
FALSE
TRUE
41
Which listed term describes this process?
beta decay
alpha decay
fission
fusion
42
Who won the Nobel prize for the photoelectric effect?
Einstein
Dirac
Planck
Heisenberg
43
How many protons are in this atom?
13
11
35
24
44
What discrepancy between experiment and theory helped lead Max Planck to his quantum theory?
the discovery of cathode rays
the discovery of electrons
the ultraviolet catastrophe
the discovery of x-rays
45
An alpha particle looks like a
photon
positron
helium nucleus
proton
46
When light from 4 to 9eV shines on ground state atoms, which jump gives the longest wavelength?
n = 3 to n = 1
n = 4 to n = 3
n = 2 to n = 1
n = 4 to n = 1
47
Which of the following phenomena gives the best evidence that particles have wave properties
compton scattering
x-rays produced by electrons striking a metal target
the interference produced by x-rays incident on a crystal
the absorption of photons by electrons in an atom
48
The energy of a photon depends on
frequency
amplitude
temperature
speed
49
Newton thought that light was a wave.
FALSE
TRUE
50
The fundamental forces that only occur in the nucleus are... (2 answers)
electromagnetic
weak
strong
gravitational
