LRA 211 Final Review Questions and Answers Latest Update 2025-2026
Who discovered the electron? - Answers JJ Thomson
The earliest atomic theory based on arrangement similar to the solar system is attributed to? -
Answers Rutherford
What are the three fundamental particles of the atom? - Answers proton, neutron and electron
what does the atomic nucleus contain? - Answers protons and neutrons
What is the component of the nucleus that has a positive charge and mass? - Answers proton
What is the component of the nucleus that has mass but no electrical charge is? - Answers
neutron
when an atom has more electrons than protons it will have: - Answers a negative charge
When an atom becomes negatively or positively charged it is usually due to a change in the
number of - Answers electrons
a negative ion is - Answers an atom with more electrons than protons
a positive ion is - Answers an atom with more protons than electrons
the electron shell closest to the nucleus is - Answers k shell
which electromagnetic radiation has the lowest energy level? - Answers radio waves
As the wave's frequency increases, the wavelength: - Answers decreases
Frequency is typically measured in: - Answers hertz
the process of removing an electron from an atom is: - Answers ionization
x-rays are produced - Answers using fast-moving electrons
what helps to keep the x-ray tube cool on the inside of the protective housing? - Answers
cooling fans and an oil bath
In terms of the x-ray tube, envelope is another name for the: - Answers glass or metal enclosure
the positive end of the x-ray tube is called? - Answers anode
the negative end of the x-ray tube is called? - Answers cathode
the area of the envelope where x-rays should exit the tube is the: - Answers target window
the anode serves as a - Answers heat conductor
, electrical conductor
target for the electron interaction to produce x-ray
what are the two types of anode designs? - Answers stationary and rotating
why is tungsten used to coat the anode disc? - Answers it has a high atomic number
With a rotating anode, the focal spot becomes a focal - Answers track
If a particle strikes a nucleus with the same amount of energy as the atom's nuclear binding
energy, what happens? - Answers it can split the atom
why do electrons stay in orbit around the nucleus? - Answers Because of their attraction to
protons
the electron binding energy is stronger when - Answers there are more protons and the electron
is closer to the nucleus
electromagnetic radiation has - Answers no mass
what kind of disturbance does electromagnetic radiation NOT cause? - Answers mechanical
which is not a form of electromagnetic radiation? - Answers sound
wavelength is - Answers the distance from the peak of one wave to the next
wavelength is measured in - Answers meters
the target window is approximately - Answers 5cm^2
what is protective tube housing lined with? - Answers lead so it can absorb radiation
what does the protective tube housing provide? - Answers solid, stable mechanical support
electrical insulation and thermal cooling
limits the radiation that can exit the tube other than toward the patient
leaking radiation can measure no more than - Answers 100 mR per hour at the distance of 1
meter
the cathode includes - Answers Filaments and focusing cup
the main purpose of the enclosure is to - Answers maintain a vacuum within the tube
glass tube enclosures are made of - Answers borosilicate glass because it can withstand high
levels of heat
Who discovered the electron? - Answers JJ Thomson
The earliest atomic theory based on arrangement similar to the solar system is attributed to? -
Answers Rutherford
What are the three fundamental particles of the atom? - Answers proton, neutron and electron
what does the atomic nucleus contain? - Answers protons and neutrons
What is the component of the nucleus that has a positive charge and mass? - Answers proton
What is the component of the nucleus that has mass but no electrical charge is? - Answers
neutron
when an atom has more electrons than protons it will have: - Answers a negative charge
When an atom becomes negatively or positively charged it is usually due to a change in the
number of - Answers electrons
a negative ion is - Answers an atom with more electrons than protons
a positive ion is - Answers an atom with more protons than electrons
the electron shell closest to the nucleus is - Answers k shell
which electromagnetic radiation has the lowest energy level? - Answers radio waves
As the wave's frequency increases, the wavelength: - Answers decreases
Frequency is typically measured in: - Answers hertz
the process of removing an electron from an atom is: - Answers ionization
x-rays are produced - Answers using fast-moving electrons
what helps to keep the x-ray tube cool on the inside of the protective housing? - Answers
cooling fans and an oil bath
In terms of the x-ray tube, envelope is another name for the: - Answers glass or metal enclosure
the positive end of the x-ray tube is called? - Answers anode
the negative end of the x-ray tube is called? - Answers cathode
the area of the envelope where x-rays should exit the tube is the: - Answers target window
the anode serves as a - Answers heat conductor
, electrical conductor
target for the electron interaction to produce x-ray
what are the two types of anode designs? - Answers stationary and rotating
why is tungsten used to coat the anode disc? - Answers it has a high atomic number
With a rotating anode, the focal spot becomes a focal - Answers track
If a particle strikes a nucleus with the same amount of energy as the atom's nuclear binding
energy, what happens? - Answers it can split the atom
why do electrons stay in orbit around the nucleus? - Answers Because of their attraction to
protons
the electron binding energy is stronger when - Answers there are more protons and the electron
is closer to the nucleus
electromagnetic radiation has - Answers no mass
what kind of disturbance does electromagnetic radiation NOT cause? - Answers mechanical
which is not a form of electromagnetic radiation? - Answers sound
wavelength is - Answers the distance from the peak of one wave to the next
wavelength is measured in - Answers meters
the target window is approximately - Answers 5cm^2
what is protective tube housing lined with? - Answers lead so it can absorb radiation
what does the protective tube housing provide? - Answers solid, stable mechanical support
electrical insulation and thermal cooling
limits the radiation that can exit the tube other than toward the patient
leaking radiation can measure no more than - Answers 100 mR per hour at the distance of 1
meter
the cathode includes - Answers Filaments and focusing cup
the main purpose of the enclosure is to - Answers maintain a vacuum within the tube
glass tube enclosures are made of - Answers borosilicate glass because it can withstand high
levels of heat
