PHYSICS 3LC FINAL EXAM COMPLETE
QUESTIONS WITH VERIFIED ANSWERS
\.READING 3
The photometer is a device that converts light to voltage which is read out by the
digital multimeter (DMM). This is due to the photoelectric effect. (Einstein won his
Nobel Prize for his explanation of the photoelectric effect.) In the photoelectric
effect, light hits a piece of metal. Quantum mechanics tells us that light can be
thought of as tiny packets of energy called photons. The photons are absorbed by
electrons and increase the energy of the electrons. Some of the electrons become
so energetic that they escape from the metal. In other words electrons are
emitted from the metal, producing a current that is amplified by the photometer.
The current goes through a resistor in the photometer. Ohm's law (V=IR) tells us
that current I going through a resistor R is associated with a voltage drop V. The
DMM measures the voltage drop across the resistor. Saturation occurs when the
metal emits the maximum flu - ANSWERS✔-it converts light into electric current
\.what are photons?
a) tiny quantized packets of light
b) neutrons
c) name of a rock group
d) protons
e) electrons - ANSWERS✔-tiny quantized packets of light
,\.what happens in the photoelectric effect?
a) Light hits a metal and photons are emitted.
b) Light hits a metal and protons are emitted.
c) Light hits a metal and electrons are emitted.
d) Electrons hit a metal and electrons are emitted.
e) Electrons hit a metal and light is emitted. - ANSWERS✔-Light hits a metal and
electrons are emitted.
\.READING 4In the photometer, light strikes a metal and electrons are emitted.
The moving electrons constitute a current that flows through a resistor RpRp. The
digital multimeter (DMM) can be set to read the voltage drop across the resistor
RpRp. The DMM has a high input impedance (resistance) that is in parallel with
RpRp. Let's denote the input impedance RDRD. Note that RD>>RpRD>>Rp.
will output a signal because of ambient electromagnetic waves, e.g., radio waves
in the air. These radio waves have an oscillating electric field that pushes electrons
in the cable connected to the DMM. These moving electrons constitute a small
current. Recall Ohm's law: V=IRV=IR. For the DMM, we can write V=IRDV=IRD. So
if RDRD is large, even a tiny current II can produce a finite voltage VV. This is why
your DMM will read a voltage even if the input cable is not connected to anything.
The cable acts like an antenna.
What should the d - ANSWERS✔-voltage
\.INTRODUCTION TO MEDICAL IMAGING:
To the human observer, the internal structures and functions of the human body
are generally invisible. However, by various technologies, images can be created
which allow a doctor to look into the body and diagnose abnormal conditions and
,guide therapeutic procedures. The medical image is a window to the body. No
image window reveals everything. Different medical imaging methods reveal
different characteristics of the human body. With each method, the range of
image quality and structure visibility can be considerable, depending on
characteristics of the imaging equipment, skill of the operator, and compromises
associated with factors such as patient radiation exposure and imaging time. [1]
READING 1:
Imaging methods create images that show the body from one of two perspectives,
through either projection (Lab Manual Fig. 1.2) or tomographic (Lab Manual Fig.
1.3) imaging. There are ad - ANSWERS✔-Produces images of selected planes or
slices of tissue of the patient's body
\.Which of the following DOES NOT describe tomographic imaging?
a) Produces images of selected planes or slices of tissue of the patient's body
b) Includes PET and MRI scans
c) A large volume of the patient's body can be viewed with one image
d) Increased visibility of objects within the imaged plane due to absence of
overlying objects
e) All of the above describes tomographic imaging - ANSWERS✔-A large volume of
the patient's body can be viewed with one image
\.An ordinary dental X-ray uses which imaging technique(s)?
a) Sonography
b) Projection
, c) Tomography
d) None of the above - ANSWERS✔-projection
\.READING 2
Depending on the application, a wide variety of particles and waves are used to
probe the body. The basic requirements for a suitable probe beam are that it can
penetrate the body (which excludes ordinary light), that is interacts with the
sample to produce useful information, and that harmful, unwanted interactions
with the body be minimal. One of the remarkable results of modern physics is that
all particles have wave properties and all waves have particle properties. For
example, "photons" and "light waves" are both electromagnetic radiation.
Conceptually, all imaging techniques consist of some form of radiation interacting
with matter. There are three things that can happen when particles/waves strike a
sample (Lab Manual Fig. 1.4). Some of the particles (a fraction of the wave energy)
are reflected. If the wave is characterized by an initial intensity Io, the ratio of the
reflected intensity Ir to inci - ANSWERS✔-It interacts with a large number of cells
\.Some wave energy can penetrate and pass through a sample. This is a
description of what type of interaction with matter?
a) Absorption
b) Reflection
c) Incidence
d) Transmission - ANSWERS✔-transmission
\.Which of the following is true for the reflection coefficient for a perfect mirror?
QUESTIONS WITH VERIFIED ANSWERS
\.READING 3
The photometer is a device that converts light to voltage which is read out by the
digital multimeter (DMM). This is due to the photoelectric effect. (Einstein won his
Nobel Prize for his explanation of the photoelectric effect.) In the photoelectric
effect, light hits a piece of metal. Quantum mechanics tells us that light can be
thought of as tiny packets of energy called photons. The photons are absorbed by
electrons and increase the energy of the electrons. Some of the electrons become
so energetic that they escape from the metal. In other words electrons are
emitted from the metal, producing a current that is amplified by the photometer.
The current goes through a resistor in the photometer. Ohm's law (V=IR) tells us
that current I going through a resistor R is associated with a voltage drop V. The
DMM measures the voltage drop across the resistor. Saturation occurs when the
metal emits the maximum flu - ANSWERS✔-it converts light into electric current
\.what are photons?
a) tiny quantized packets of light
b) neutrons
c) name of a rock group
d) protons
e) electrons - ANSWERS✔-tiny quantized packets of light
,\.what happens in the photoelectric effect?
a) Light hits a metal and photons are emitted.
b) Light hits a metal and protons are emitted.
c) Light hits a metal and electrons are emitted.
d) Electrons hit a metal and electrons are emitted.
e) Electrons hit a metal and light is emitted. - ANSWERS✔-Light hits a metal and
electrons are emitted.
\.READING 4In the photometer, light strikes a metal and electrons are emitted.
The moving electrons constitute a current that flows through a resistor RpRp. The
digital multimeter (DMM) can be set to read the voltage drop across the resistor
RpRp. The DMM has a high input impedance (resistance) that is in parallel with
RpRp. Let's denote the input impedance RDRD. Note that RD>>RpRD>>Rp.
will output a signal because of ambient electromagnetic waves, e.g., radio waves
in the air. These radio waves have an oscillating electric field that pushes electrons
in the cable connected to the DMM. These moving electrons constitute a small
current. Recall Ohm's law: V=IRV=IR. For the DMM, we can write V=IRDV=IRD. So
if RDRD is large, even a tiny current II can produce a finite voltage VV. This is why
your DMM will read a voltage even if the input cable is not connected to anything.
The cable acts like an antenna.
What should the d - ANSWERS✔-voltage
\.INTRODUCTION TO MEDICAL IMAGING:
To the human observer, the internal structures and functions of the human body
are generally invisible. However, by various technologies, images can be created
which allow a doctor to look into the body and diagnose abnormal conditions and
,guide therapeutic procedures. The medical image is a window to the body. No
image window reveals everything. Different medical imaging methods reveal
different characteristics of the human body. With each method, the range of
image quality and structure visibility can be considerable, depending on
characteristics of the imaging equipment, skill of the operator, and compromises
associated with factors such as patient radiation exposure and imaging time. [1]
READING 1:
Imaging methods create images that show the body from one of two perspectives,
through either projection (Lab Manual Fig. 1.2) or tomographic (Lab Manual Fig.
1.3) imaging. There are ad - ANSWERS✔-Produces images of selected planes or
slices of tissue of the patient's body
\.Which of the following DOES NOT describe tomographic imaging?
a) Produces images of selected planes or slices of tissue of the patient's body
b) Includes PET and MRI scans
c) A large volume of the patient's body can be viewed with one image
d) Increased visibility of objects within the imaged plane due to absence of
overlying objects
e) All of the above describes tomographic imaging - ANSWERS✔-A large volume of
the patient's body can be viewed with one image
\.An ordinary dental X-ray uses which imaging technique(s)?
a) Sonography
b) Projection
, c) Tomography
d) None of the above - ANSWERS✔-projection
\.READING 2
Depending on the application, a wide variety of particles and waves are used to
probe the body. The basic requirements for a suitable probe beam are that it can
penetrate the body (which excludes ordinary light), that is interacts with the
sample to produce useful information, and that harmful, unwanted interactions
with the body be minimal. One of the remarkable results of modern physics is that
all particles have wave properties and all waves have particle properties. For
example, "photons" and "light waves" are both electromagnetic radiation.
Conceptually, all imaging techniques consist of some form of radiation interacting
with matter. There are three things that can happen when particles/waves strike a
sample (Lab Manual Fig. 1.4). Some of the particles (a fraction of the wave energy)
are reflected. If the wave is characterized by an initial intensity Io, the ratio of the
reflected intensity Ir to inci - ANSWERS✔-It interacts with a large number of cells
\.Some wave energy can penetrate and pass through a sample. This is a
description of what type of interaction with matter?
a) Absorption
b) Reflection
c) Incidence
d) Transmission - ANSWERS✔-transmission
\.Which of the following is true for the reflection coefficient for a perfect mirror?
