PHYSICS RADIATION EXAM 3 QUESTIONS WITH
100% CORRECT ANSWERS || 2025.2026 UPDATE
SUBJECT: ouhsc physics radiation radiationphysics
sonography
\Q\.What are atoms?-ANSWERS-✔fundamental constituents of matter that maintain the
properties of that element of matter
\Q\.How are electrons held in place?-ANSWERS-✔binding energy (from the nucleus)
nucleus has a positive charge, attracting the electrons and holding them in place
\Q\.What are the 3 units for energy?-ANSWERS-✔joules
erg
eV
\Q\.What does the value of an atom's binding energy tell you?-ANSWERS-✔the value of an
atom's binding energy is the amount of energy that it would take to completely remove the
electron from the atom
\Q\.What determines an atom's chemical properties?-ANSWERS-✔its electron configuration
,\Q\.What determines an atom's stability?-ANSWERS-✔its nuclear configuration
remember:
stable means not radioactive
unstable means radioactive
\Q\.An atomic mass unit is a way to discuss the mass of an atom.
How do we describe an amu?-ANSWERS-✔an amu is equal to 1/12 the mass of a C–12 (carbon
12) atom
or
1.6605 x 10^–27 = 1 amu
\Q\.Z stands for an atom's
a. mass number
b. atomic number
c. number of neutrons
d. number of electrons-ANSWERS-✔atomic number
(which is the number of protons)
\Q\.A stands for an atom's
, a. mass number
b. atomic number
c. number of neutrons
d. number of electrons-ANSWERS-✔mass number
(which is the number of protons + neutrons or the number of "nucleons")
\Q\.True or False:
Isotope means radioactive.-ANSWERS-✔False.
An isotope of an element is one that has the same number of protons but a different number of
neutrons.
\Q\.What principle does electrostatic force refer to?
What works against the electrostatic force an atom's nucleus?-ANSWERS-✔like charges repel
strong nuclear force works against & exceeds the electrostatic force by ~100x
\Q\.What does mass defect mean?
What does it represent?-ANSWERS-✔the mass of the parts is greater than the mass of the
whole
it represents the mass equivalent of the amount of energy that must be applied to separate the
nucleus into its individual components
100% CORRECT ANSWERS || 2025.2026 UPDATE
SUBJECT: ouhsc physics radiation radiationphysics
sonography
\Q\.What are atoms?-ANSWERS-✔fundamental constituents of matter that maintain the
properties of that element of matter
\Q\.How are electrons held in place?-ANSWERS-✔binding energy (from the nucleus)
nucleus has a positive charge, attracting the electrons and holding them in place
\Q\.What are the 3 units for energy?-ANSWERS-✔joules
erg
eV
\Q\.What does the value of an atom's binding energy tell you?-ANSWERS-✔the value of an
atom's binding energy is the amount of energy that it would take to completely remove the
electron from the atom
\Q\.What determines an atom's chemical properties?-ANSWERS-✔its electron configuration
,\Q\.What determines an atom's stability?-ANSWERS-✔its nuclear configuration
remember:
stable means not radioactive
unstable means radioactive
\Q\.An atomic mass unit is a way to discuss the mass of an atom.
How do we describe an amu?-ANSWERS-✔an amu is equal to 1/12 the mass of a C–12 (carbon
12) atom
or
1.6605 x 10^–27 = 1 amu
\Q\.Z stands for an atom's
a. mass number
b. atomic number
c. number of neutrons
d. number of electrons-ANSWERS-✔atomic number
(which is the number of protons)
\Q\.A stands for an atom's
, a. mass number
b. atomic number
c. number of neutrons
d. number of electrons-ANSWERS-✔mass number
(which is the number of protons + neutrons or the number of "nucleons")
\Q\.True or False:
Isotope means radioactive.-ANSWERS-✔False.
An isotope of an element is one that has the same number of protons but a different number of
neutrons.
\Q\.What principle does electrostatic force refer to?
What works against the electrostatic force an atom's nucleus?-ANSWERS-✔like charges repel
strong nuclear force works against & exceeds the electrostatic force by ~100x
\Q\.What does mass defect mean?
What does it represent?-ANSWERS-✔the mass of the parts is greater than the mass of the
whole
it represents the mass equivalent of the amount of energy that must be applied to separate the
nucleus into its individual components
