Physics 1311
Test #3
1. The Doppler effect
a.
Describes the way the velocity of a wave appears to change if there is relative
motion between the wave source and the observer
b.
Describes the way the frequency of a wave appears to change if there is relative
motion between the wave source and the observer
c.
d.
e.
Is the reason that stars are red or blue
Results from constructive interference of sound waves
Results from destructive interference of sound waves
2. An example of a transverse wave is:
a.
An electromagnetic wave
b.
A sound wave
c.
A water wave
d.
Both a and b
e.
Both a and c
3. Radio waves
a.
Are characterized by high energies and long wavelengths
b.
Are characterized by low energies and short wavelengths
c.
Are characterized by high energies and short wavelengths
d.
Are characterized by low energies and long wavelengths
e.
Both a and c
4. When two waves of the same frequency interfere destructively,
a.
The resultant wave has lower amplitude and higher frequency
b.
The resultant wave has higher amplitude and lower frequency
c.
The resultant wave has lower amplitude and the same frequency
d.
The resultant wave has higher amplitude and the same frequency
e.
The resultant wave has completely disappeared
5. Absorption occurs when an electron:
a.
Releases energy in the form of a photon and drops to a lower energy level
b.
Acquires energy from a photon and drops to a lower energy level
c.
Releases energy in the form of a photon and shifts to a higher energy level
d.
Acquires energy from a photon and shifts to a higher energy level
e.
None of the above
6. An emission spectra occurs when
a.
Electrons release energy in the form of photons and shift to lower energy levels
b.
c.
d.
e.
Protons gain energy and radiate
Protons emit energy in the form of photons
Electrons gain energy and shift to higher energy levels
All of the above
7.
A one-electron Bohr atom with 6 available energy levels is capable of producing
a.
5 emission lines
b.
8 emission lines
c.
10 emission lines
d.
15 emission lines
e.
12 emission lines
8.
The acronym for laser is:
a.
Light Amplification by the Simulated Emission of Radiation
b.
Light Amplification by the Serious Extraction of Radiation
c.
Light Accentuation by the Stimulated Emission of Radiation
d.
Light Amplification by the Stimulated Emission of Radiation
9.
Lasing action in a laser occurs when:
a.
A photon of light is absorbed and quickly emitted by an atom
b.
Two photons of light are simultaneously emitted by an excited atom
c.
One photon causes an excited atom to emit an identical photon
d.
Two identical photons stimulate an excited atom to emit another photon
10.
The three essential parts of every physical measurement are:
a.
sample, source of energy, detector
b.
detector, sample, computer
c.
electron, photon, quark
d.
sample, sound, detector
e.
sample, source, sound
11.
If a pitcher throws a 0.2 kg baseball at 150 km/hr and it is determined at a point in time
that the ball is within a 1 meter range of home plate, to what precision can we know the
speed of the ball?
a.
6.63 x 10 -34 km/hr
b.
3.32 x 10 -33 km/hr
c.
1.19 x 10 -32 km/hr
d.
2.75 x 10 -34 km/hr
e.
3.32 x 10 –23 km/hr
12.
The Heisenberg uncertainty principle states:
a.
We are not certain about what is going on at the quantum level
b.
At the quantum scale, any measurement alters the object being measured
c.
At the quantum scale, it is impossible to know anything for certain
d.
At the quantum scale, only position and speed can be measured
e.
I’m just not certain …
13.
The photoelectric effect:
a.
Won Einstein the Nobel prize
b.
Can only be explained by the particle nature of light
c.
Can only be explained by the wave nature of light
d.
Both a and b
e.
Both a and c
14.
A quantum leap occurs
a.
only when an electron moves between energy levels and emits a photon.
b.
only when an electron absorbs a photon and reaches a more excited state.
c.
whenever an electron moves between energy levels.
d.
only when an electron moves two or more energy levels at once.
e.
whenever a photon moves more than one energy level at once and emits an
electron.
15.
Young's famous double slit experiment:
a.
Can only be explained by the wave nature of light
b.
Can only be explained by the particle nature of light
c.
Illustrates one aspect of wave-particle duality
d.
Both b and c
e.
Both a and c
16.
For the element shown below, now many protons and neutrons are in the nucleus?
14
6
a.
b.
c.
d.
17.
C
14,6
6,8
8,6
6,6
Which part of an atom determines its identity?
a.
protons and neutrons in the nucleus
b.
electrons
c.
protons in the nucleus
d.
neutrons in the nucleus
e.
ion
18.
What is the atomic number?
a.
the number of atoms in a quantity of matter
b.
the number of protons in the nucleus
c.
the number of electrons in orbit
d.
the connections in the atomic bonds
e.
the number of neutrons in the atom
19.
How do two isotopes of the same element differ?
a.
Their nuclei have different numbers of protons.
b.
Their electrons have different orbits.
c.
They have different charge states.
d.
Their neutrons differ in number.
e.
They have a different atomic number.
20.
The electric charge of an atom is calculated by
a.
subtracting the number of protons from the number of neutrons.
b.
subtracting the number of neutrons from the number of electrons.
c.
subtracting the number of protons from the number of nuclei.
d.
subtracting the number of protons from the number of electrons.
e.
subtracting the number of electrons from the number of protons.
21.
Which force holds the nucleus together?
a.
gravity
b.
strong force
c.
weak force
d.
electromagnetic force
e.
centripetal force
22.
If an atom emits two protons and two neutrons, the atom has
a.
emitted an alpha particle.
b.
changed the mass and chemical identity of the atom.
c.
produced a small amount of helium.
d.
all of these
Beta decay in radioactive material involves spontaneous transformation of a neutron to
a.
alpha particles.
b.
an electron.
c.
an electron and a proton.
d.
a neutrino and an electron.
e.
alpha particles and a proton.
23.
24.
Nuclear fission
a.
generates the energy in stars.
b.
occurs when several smaller nuclei are created from one larger nuclei.
c.
derives its energy from the rearrangement of electrons orbiting atoms of uranium 235.
d.
is one of the processes taking place in the control rods of a nuclear reactor
e.
brings together four protons to create plutonium.
25.
Nuclear fusion
a.
brings two nuclei together to form a third.
b.
can result in a transfer of mass to energy.
c.
combines four hydrogen nuclei into a helium nucleus.
d.
is the source of the heat energy in sunlight.
e.
all of the above
26.
Andrea was watching her little brother floating on a raft at the beach and noticed that the
waves were hitting the shore at a frequency of 0.25 Hz. How many waves hit the shore in
24 seconds?
a.
4
b.
5
c.
6
d.
7
e.
8
27.
If the distance between the crests of the waves in Problem 26 was 3 meters, how fast are
the waves moving toward the shore?
a.
12 m/s
b.
3 m/s
c.
0.75 m/s
d.
1.25 m/s
e.
1.75 m/s
28.
How many half-lives would it take for 2 kg of a radioactive substance to decay to 62.5
gms?
a.
10
b.
8
c.
4
d.
5
e.
7
29.
How much energy is contained in 25 grams of sugar?
a.
2.25 x 1018 joules
b.
8.33 x 1018 joules
c.
2.25 x 1015 joules
d.
5.5 x 109 joules
e.
7.5 x 106 joules