RAD PHYSICS.
X-rays originate outside the nucleus, in the electron shells.
What is Frequency?
The number of wavelengths that pass a point of observation per second.
What is the Quantum theorem?
every physical body can emit and absorb energy. Smallest unit of energy is known as a quantum.
What was Einsteins equation for his theory of relativity?
E=MC^2
What is a Photon?
A quantum of electromagnetic energy. The quantum travels through space at the speed of light.
What is the Electromagnetic Spectrum?
Includes entire range of electromagnetic energy.
What is Wavelength?
The distance from one crest to another, from one valley to another, or any point in the sine wave to the next corresponding point.
What is Issac Newtons First Law?
Intertia, a body will remain at rest or will continue to move with constant velocity in a straight line unless acted upon by an external force.
Who was William Coolidge?
Unveiled hit hot cathode x-ray tube to the medical community in 1913. Known for the Coolidge tube which is still in use today.
What is an X-ray?
a form of high energy electromagnetic radiation with a short wavelength, capable of penetrating materials.
What are the 3 regions we care about as radiographers in regard to the Electromagnetic Spectrum?
Visible light, x-rays, gamma rays, and RF
What does "low energy and long waves" mean?
A wave with a low frequency and a long wavelength, meaning it carries less energy.
What is Issac Newtons Second Law?
Force, The force (F) that acts on an object is equal to the mass (m) of the object multiplied by the acceleration (a) produced.
What is the Coolidge Tube?
vacuum tube that allowed x-ray intensity and energy to be selected separately and with great accuracy.
What is an Electron?
Negatively charged subatomic particle that orbits the nucleus of an atom.
What is the Inverse Square Law?
The decrease in intensity is inversely proportional to the square of the distance of the object from the source. As distance increases, intensity decreases.
What does High-frequency, short-waves" mean?
A wave with a high frequency and short wavelength, signifying a higher energy level.
What is Issac Newtons Third Law?
Action/reaction, for every action, there is an equal and opposite reaction.
Who was Neils Bohr?
1. developed the "Bohr Atom" in 1913
2. His atom was a miniature solar system in which electron revolved about the nucleus in prescribed orbits or energy.
What is an Atom?
The smallest unit of a chemical element. consists of positive protons and neutrons, and negative electron cloud.
What is Velocity?
Speed (C). the measure of how fast something is moving, the rate of change of its position with time.
Who was Max Planck?
1. German physicist, developed the quantum theorem
Why was Albert Einstein important?
His theory of relatively determined that matter and energy are Interchangeable.
What is a quantum?
A bundle of energy, travels through space, has no mass, no charge, and travels in a straight line.
How are a quantum, photon, x-ray, electron, and an atom related?
1.X-rays are essentially photons emitted from excited atoms due to electron transitions.
2. the concept of "quantum" describes the discrete packets of energy involved in this process