Khan's The Physics in Radiation Therapy 6/e Chapter
1 Practice Questions
elements - CORRECT ANSWER "All matter is composed of individual entities called
___________."
atom - CORRECT ANSWER "Each element is distinguishable from the others by the physical
and chemical properties of its basic component—the ________"
nucleus - CORRECT ANSWER "Each atom consists of a small central core, the __________,
where most of the atomic mass is located and a surrounding "cloud" of electrons moving in
orbits around it."
10⁻¹⁰m - CORRECT ANSWER the radius of an atom
10⁻¹⁵m - CORRECT ANSWER the radius of the nucleus
protons and neutrons - CORRECT ANSWER "The nucleus contains two kinds of fundamental
particles: ____________ and ___________"
isotopes - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having nuclei with the
same number of protons but different number of neutrons"
isotones - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having the same number
of neutrons but different number of protons"
, isobars - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having the same number
of nucleons but different number of protons"
isomers - CORRECT ANSWER ATOM CLASSIFICATION: "atoms containing the same
number of protons as well as neutrons"
nuclear stability - CORRECT ANSWER means that the nucleus of an element is stable and thus
it does not decay spontaneously emitting any kind of radioactivity.
1u = 1.661∙10⁻²⁷kg - CORRECT ANSWER in basic units of mass, 1u= ? kg
atomic mass - CORRECT ANSWER "The mass of an atom expressed in terms of u is known as
_____ _____"
relative atomic mass or the atomic weight - CORRECT ANSWER "The average mass of atoms
of an element in a sample (i.e., which may contain different isotopes) expressed in terms of u is
known as the ________ or the ________"
gram atomic weight - CORRECT ANSWER "is defined as the mass in grams numerically equal
to the atomic weight"
Avogadro's law - CORRECT ANSWER law that states that "every gram atomic weight of a
substance contains the same number of atoms"
6.022∙10²³ atoms per gram atomic weight (mole) - CORRECT ANSWER "Avogadro constant
(NA), has been measured by many investigators, and its currently accepted value is _______"
mass defect - CORRECT ANSWER "when the nucleus is formed, a certain mass is destroyed
and converted into energy that acts as a "glue" to keep the nucleons together. This mass
difference is called the _____ ______."
1 Practice Questions
elements - CORRECT ANSWER "All matter is composed of individual entities called
___________."
atom - CORRECT ANSWER "Each element is distinguishable from the others by the physical
and chemical properties of its basic component—the ________"
nucleus - CORRECT ANSWER "Each atom consists of a small central core, the __________,
where most of the atomic mass is located and a surrounding "cloud" of electrons moving in
orbits around it."
10⁻¹⁰m - CORRECT ANSWER the radius of an atom
10⁻¹⁵m - CORRECT ANSWER the radius of the nucleus
protons and neutrons - CORRECT ANSWER "The nucleus contains two kinds of fundamental
particles: ____________ and ___________"
isotopes - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having nuclei with the
same number of protons but different number of neutrons"
isotones - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having the same number
of neutrons but different number of protons"
, isobars - CORRECT ANSWER ATOM CLASSIFICATION: "atoms having the same number
of nucleons but different number of protons"
isomers - CORRECT ANSWER ATOM CLASSIFICATION: "atoms containing the same
number of protons as well as neutrons"
nuclear stability - CORRECT ANSWER means that the nucleus of an element is stable and thus
it does not decay spontaneously emitting any kind of radioactivity.
1u = 1.661∙10⁻²⁷kg - CORRECT ANSWER in basic units of mass, 1u= ? kg
atomic mass - CORRECT ANSWER "The mass of an atom expressed in terms of u is known as
_____ _____"
relative atomic mass or the atomic weight - CORRECT ANSWER "The average mass of atoms
of an element in a sample (i.e., which may contain different isotopes) expressed in terms of u is
known as the ________ or the ________"
gram atomic weight - CORRECT ANSWER "is defined as the mass in grams numerically equal
to the atomic weight"
Avogadro's law - CORRECT ANSWER law that states that "every gram atomic weight of a
substance contains the same number of atoms"
6.022∙10²³ atoms per gram atomic weight (mole) - CORRECT ANSWER "Avogadro constant
(NA), has been measured by many investigators, and its currently accepted value is _______"
mass defect - CORRECT ANSWER "when the nucleus is formed, a certain mass is destroyed
and converted into energy that acts as a "glue" to keep the nucleons together. This mass
difference is called the _____ ______."
