fill the blanks -14
the human body is transparent to...... waves, becomes opaque in the visible light diapason, and becomes more transparent again to ...... ray
radio; x
892.If there are no pairs of energy states in the material such that dE=hf for a specific frequency, then the material will be ...... to that frequency.
transparent
The energy of infrared radiation is appropriate for producing molecular.....
vibration
The use of microwave radiation for heat therapy is referred to as....
diathermy
The low frequency end of the infrared diapason is called the „......“ range and the upper end is called the „......“ range.
far infrared; near infrared
If the temperature of a hot body increases, the radiated energy...... and the frequency at which the intensity peaks .....
increases; also increases.
Infrared radiation penetrates more strongly than visible light, and this fact is used in......
infrared tomgraphy for diagnostic purposes
The human body is an efficient radiator and the peak of its radiation curve is in the..... region.
infrared
The method for studying the temperature distribution in human skin by using sensitive infrared detectors is referred to as .....
infrared thermography
The high energy ultraviolet photons may.... electrons to higher energy states,..... electrons from atoms or molecules to produce ions and.... molecules into their constituent atoms.
excite; eject; dissociate
.X-rays are produced when accelerated electrons by a high..... strike a metal target.
voltages
The continous x-ray radiation is sometimes called Bremsstrahlung, a German word meaning ....
braking radiation.
The kinetic energy of the ejected electron is equal to the.... of the photon minus the work required to remove the electron from its molecular environment.
energy
The energy level separations are small in the lighter atoms (carbon, oxygen, hydrogen) and they are practically transparent to ......
x-rays.
In infrared thermography, a brighter image in a given skin region indicates that the region is at a higher .....
Temperature
.Of the heavy elements that efficiently absorb x-rays, ..... is the most widely used shielding material because of its comparatively low cost and availability.
barium
The process of injecting a dye containing heavy-element x-ray absorbers into the blood vessles is referred to as.....
angiography
Computed tomography or CT scans produce a .... view of part of the body.
cross-sectional
A tomograph is an image of a....
slice
The nuclear magnetic resonance scan does not use ionizing radiation to make images. .... waves and.... fields, are used to make the images.
Radio frequency; electromagnetic
The word LASER is an acronym meaning ....
Representing light Amplification by stimulated Emission of Radiation.
912.If a photon interacts with an atom when the electron is in the higher energy state, it may cause it to make the downward transition sooner than it would by the spontaneous process. This is called.... emission.
stimulated
...... occurs when atoms or molecules exist in a state with more
electrons in the upper energy states than in the lower energy states.
Population inversion
.Some atomic and molecular excited states have much longer lifetimes (from 10^-6s up to several min) before an electron makes a downward transition. These excited states are called.... states.
metastable
A laser, emitting light in short bursts, has been proven very effective in photocoagulation of....
the retina
The production of three-dimensional images using laser light occurs by a process known as....
holography
One of the most important properties of laser light is its ...... Hence, the laser waves can interfere with each other..... or..... in a manner similar to the adding and subracting waves on the surface of water.
coherence; constructively; destructively
The ideal system that absorbs all the radiation incident on it is called .....
black body
Wien ́s displacement law states that: ..../formula/, where
....
lambda Tmax=0,29*10^-2mk; lambda max=maximum of wavelength, T=temperature.
The German word Bremsstrahlung means ....
braking radiation