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Ch 3 RAD 150

Electromagnetic Energy

Electromagnetic energy exists over a wide range called an energy _____. continuum
An x-ray photon is a ____ of electromagnetic energy. quantum
_____ _______ showed that visible light has both electric and magnetic properties. James Maxwell
The velocity of all electromagnetic radiation is _______. 3x10 to the eighth m/s
Simplistically, sine waves are variations of _____ over time. amplitude
_______ is one half the range from crest to valley over which the sine wave varies. Amplitude
One hertz (Hz) is equal to __ cycle per second. one
_______ is the number of wavelengths that pass a point of observation per second. Frequency
As frequency increases, wavelength will ______. decrease
Wavelength is represented by the greek letter _____. lambda
Frequency is expressed in _____; wavelength (lambda) is expressed in _____. hertz; meters
A photons energy is directly proportional to its ______. frequency
The ____ _____ ____ applies to all electromagnetic radiation. inverse square law
The ______ is the distance from one crest another, from one valley to another or from any point on the sine wave to the next corresponding point. wavelength
As the velocity decreases, the _____ decreases proportionately. frequency
At a given velocity, wavelength and ______ are inversely proportional. frequency
The _____ range of electromagnetic energy extends from approximately 10 (2) to 10 (24) Hz. frequency
The deviation of light when it passes from one transparent medium to another is called _____. refraction
_________ have low energies and long wavelengths. Radio frequencies
Microwave radiation has a ____ wavelength. short
The only difference between x-rays and gamma rays is their _____. origin
X-rays are emitted from the _______, while gamma rays come from inside the ____ of a radioactive atom. electron cloud; nucleus
The phenomenon in which light and x ray photons behave like particles and waves is called _____ ______. wave-particle duality
Electromagnetic energy _______ is the reduction in intensity that results from scattering and absorption. attenuation
What are the three degrees of interaction between light and an absorbing material? transparency, translucency and opacity
Structures that absorb x rays are called _____. radiopaque (bone)
Structures that transmit x rays are called ______. radiolucent (lungs)
Radiation intensity is ______ related to the square of the distance from the source. inversely
The inverse square law can be applied to distanced greater than ___ times the longest dimension of the source. seven
X ray energy ranges from __ keV to __ MeV 10 - 50
What is Planck's Quantum equation? E=hf
Planck's constant is symbolized by the letter __ and has a numeric value of ____ eVs. h; 4.15 x 10 (-15)
The longer the wave length of electromagnetic energy, the ____ the energy of each photon. lower
Which law states that matter can be neither created nor destroyed? Law of conservation of matter
Which law states that energy can be neither created nor destroyed? Law of conservation of energy
_____ _____ is an example of converting matter into energy. Nuclear fission
One ____ is equal to 6.24 x 10 (18) eV Joule
What is the wave equation? velocity= frequency x wavelength
What is the electromagnetic wave equation? constant=frequency x wavelength (lambda) f=c/wavelength wavelength=c/f