Unit 3 Chapter 3 Flashcards
A form of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space
Electromagnetic energy
Electromagnetic Energy that has neither mass nor electric charge but interacts with matter as though it is a particle
Photon
The smallest quantity of electromagnetic energy
Photon
A small bundle of energy
Quantum
Travels at the speed of light
Photon
What forms of electromagnetic energy are described as photons?
X-rays light and other forms
The smallest quantity of any type of electromagnetic radiation is a(n) _____
The smallest quantity of any type of electromagnetic radiation is a photon.
What is the velocity of all electromagnetic radiation?
The velocity of all electromagnetic radiation is 3 ´ 108 m/s
A hertz (Hz) is equal to _____ cycle(s) per second.
A hertz is equal to 1 cycle per second
The _____ of electromagnetic radiation is constant.
The velocity of electromagnetic radiation is constant.
If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must _____.
If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must decrease by half
The intensity of radiation _____ in _____ proportion to the square of the distance of the object from the source.
The intensity of radiation decreases in inverse proportion to the square of the distance of the object from the source
The reduction of radiation intensity due to scattering and absorption is called _____
The reduction of radiation intensity due to scattering and absorption is called attenuation.
The intensity of radiation on an object is reduced with distance because the radiation _____.
The intensity of radiation on an object is reduced with distance because the radiation is spread out over a greater area.
If the intensity of light from a flashlight is 4 millilumens (mlm) at a distance of 3 feet, what will the intensity be at 6 feet?
If the intensity of light from a flashlight is 4 millilumens (mlm) at a distance of 3 feet using the inverse square law, it will be 1 millilumen at 6 feet.
The energy of a photon is directly proportional to its _____.
The energy of a photon is directly proportional to its frequency.
The mass equivalent of a 100 KeV photon of radiation can be calculated using the _____.
The mass equivalent of a 100 KeV photon of radiation can be calculated using the relativity formula.
X-rays are usually identified by their _____.
X-rays are usually identified by their energy
The lowest energy range of the electromagnetic spectrum is _____.
The lowest energy range on the electromagnetic spectrum is radio waves.
Gamma rays are produced in the _____ of the atom.
Gamma rays are produced in the nucleus of the atom.
Photons tend to interact with matter _____ their wavelength
Photons tend to interact with matter equal in size to their wavelength.
Photons with the highest frequencies have the _____
Photons with the highest frequencies have the shortest wavelengths
A fluoroscopy unit is run at 30 inches source-to-skin distance and produces an exposure of 100mR/week. What is the exposure if it is run at 90 inches source to skin distance?
11.1 mR/week
What type of relationship does frequency and wavelength have in the electromagnetic spectrum?
Inverse relationship
What happens to the frequency of a sine wave if the wavelength is doubled?
Frequency is halved
Which portion of the electromagnetic spectrum contains photons withthe highest velocity?
No change in velocity
Which color of visible light has the longest wavelength?
red
Which color of visible light has the highest energy?
violet
Which of the following does NOT use microwaves?
doppler radar monitoring
cell phone communication
speed monitoring
TV remote controls
TV remote controls
What differentiates a light photon from an x ray photon
frequency
wavelength
energy
velocity
all of the above
a, b and c
a, b, and c
Which of the following relationships is TRUE concerning the energy of electromagnetic radiation?
The energy of a wave will increase as it wavelength increases
The energy of a wave will increase as its frequency increases
The energy increases as the velocity of the wave increases
The energy of the wave increases as the mass increases
The energy of a wave will increase as its frequency increases
The partial absorption of energy by any form of matter is termed
Diffraction
Exitation and immediate release of a photon is
Reflection
The mass-energy equivalency of electromagnetic energy and matter was first predicted by:
Albert Einstein
Which of the following is not a variation of the electromagnetic wave equation?
c=fl
E=hf
f=c/l
l=c/f
E=hf
Electromagnetic radiation travels:
In waves along a striaght path
Electromagnetic radiation travels in bundles of energy called
Photons
Wavelength is defined as the distance from:
Peak to peak of the wave
Waves of radiation are called
Sine waves
Frequency is defined as:
The number of waves passing a point per unit of time
Wavelength and frequency are
Inversely proportional to each other
All photons with wavelengths longer than x-rays act primarily as waves. T or F
True
