1917972
Descrição
Questão 1
Questão
Electromagnetic Waves are composed of:
Responda
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Electric and magnetic fields, oscillating in-phase
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Electric and magnetic fields, oscillating out of phase
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Electric and magnetic fields, oscillating sometimes in and sometimes out of phase
Questão 2
Questão
Which of the following electromagnetic wavelengths λ can be detected by the human eye:
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200 nm
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500 nm
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1000 nm
Questão 3
Questão
Radiation is monochromatic when:
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It is composed of a single wavelength
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Waves oscillate with a constant phase difference
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Waves have equal intensity
Questão 4
Questão
Wavelength λ of visible light is in the range of:
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Up to 10 nm
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from 10 nm to 380 nm
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from 380 nm to 760 nm
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from 0.76 µm to 1000 µm
Questão 5
Questão
Frequency of visible light is higher than the frequency of:
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IR
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UV
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X-Rays
Questão 6
Questão
Metal vessels are not used in microwave ovens because:
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Electric permittivity ε and magnetic permeability μ of metals is high and microwaves would generate high currents in the metal, causing heating and damage.
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Metals vessel block microwave radiation from reaching the food
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Substances are emitted from the metal, that affect the food.
Questão 7
Questão
The expression electromagnetic waves oscillate means:
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Electromagnetic waves continuously change direction of propagation
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Electric E and magnetic H field vectors change in time
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Electromagnetic waves cause vibrations in the propagation medium
Questão 8
Questão
Which is the most significant application of de Broglie wavelength in medicine:
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The electron microscope
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The endoscope
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The optic microscope
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The polarization microscope
Questão 9
Questão
Radiation protection standards for electromagnetic waves (EM) limit three of the following quantities. Which quantity is NOT limited:
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Frequency of EM waves
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Energy Load EH [W.h/m2]
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Electric field intensity E [V/m]
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Magnetic field intensity H [A/m]
Questão 10
Questão
Total internal reflection can occur if light passes from:
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A material of low optical density to a material of high optical density
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A material of high optical density to a material of low optical density
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Air to Water
Questão 11
Questão
The most significant application of total internal reflection in medicine:
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The Endoscope
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The Dioptometer
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The Laser
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The Ophtalmoscope.
Questão 12
Questão
Which mode of light reflection is called diffusion:
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From a mirror surface
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From a surface with irregularities greater than lights wavelength
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From a calm water surface
Questão 13
Questão
Which reflection mode of light if called specular:
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From the surface of a pure mountain lake
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From a metal surface
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From a surface with irregularities considerably smaller than light's wavelength.
Questão 14
Questão
The coefficient of reflection of light does not depend on:
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The angle of incidence
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The index of refraction - n
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The wavelength λ of the light
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The density ρ of the two media
Questão 15
Questão
Endoscopes are used in medicine for examination of:
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The brain
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The teeth
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Hollow Organs
Questão 16
Questão
The imagine formed by a direct opthalmoscope (magnification up to 15x) is:
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Virtual and erect
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Virtual and Inverted
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Real and Erect
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Real and Inverted
Questão 17
Questão
The image formed by a indirect ophthalmoscope (magnificantion 2x / 5x) is:
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Virtual and Erect
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Virtual and Inverted
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Real and Erect
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Real and Inverted
Questão 18
Questão
Absorption spectrum of melanin (skin pigment, iris, hair, etc) is msotly in the:
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Visible range
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UV A Range
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IR C Range
Questão 19
Questão
Analysis of colloidal solutions is carried out using:
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Standard Spectrophotometer
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Echograph
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Radionuclide Generator
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Turbidimeter/Nephelometer
Questão 20
Questão
When light is polarized, the electric field vector E oscillates in the direction:
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Of light propagation
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Perpendicular to light propagation
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Of magnetic field vector H
Questão 21
Questão
When light is completely polarized, the electric field vector E oscillates
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In all directions in a plane perpendicular to the velocity of light
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In one direction coinciding with the velocity of light
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In one direction in a plane perpendicular to the velocity of light
Questão 22
Questão
The angle of rotation of the plane of polarized light coefficient is proportional to: (C - Concentration of solution in %; l - thickness of the substance layer in dm)
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Cl;
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C/l;
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l/C;
Questão 23
Questão
The specific rotation angle for camphor [+42 0] means that this pharmaceutical rotates the plane of polarization:
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Clockwise(left-handed)
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Counter-clockwise (right-handed)
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In the two directions depending on the angle of incidence of light
Questão 24
Questão
The rotation angle of polarized light α (a property of optically active pharmaceuticals) is determined by the method of:
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Echography
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Photocolorimetry
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Spectropolarimetry
Questão 25
Questão
How do polarized microscopes improve on conventional optical microscopes
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Higher resolution
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Visualization of optically active structures, indiscernible for conventional microscopes
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Direct observation of examined objects
Questão 26
Questão
Which optical phenomenon, other than polarization, is used in polarimetry:
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Total internal reflection
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Light scattering
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Light dispersion
Questão 27
Questão
The concentration of which substance can be determined using polarimetry
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Urea
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Uric Acid
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Glucose in the blood plasma and urine
Questão 28
Questão
Longitudinal waves cannot be:
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Reflected
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Diffracted
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Dispersed
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Polarized
Questão 29
Questão
The atmospheric ozone layer absorbs mostly:
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UV rays
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Visible light
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IR rays
Questão 30
Questão
Energy of UV light is lower than the energy of
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Visible light
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IR light
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x-rays
Questão 31
Questão
UV radiation is:
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Electromagnetic waves
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Flux of protons
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Flux of electrons
Questão 32
Questão
UV radiation has wavelengths shorter than:
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Visible light
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x-rays
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Gamma-rays
Questão 33
Questão
UV radiation has wavelengths longer than
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Visible light
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IR light
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X-rays
Questão 34
Questão
Sun protection factor (SPF) specifies UV protection mainly in the region of:
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UV A
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UV B
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UV C
Questão 35
Questão
Why is UV light in the 10 nm to 200 nm range NOT included in UVA, UVB or UVC ranges:
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UV radiation from the Sun in this interval is absorbed by the atmosphere
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UV radiation in this interval cannot be produced artificially
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Photo-biological effects of such radiation are unknown.
Questão 36
Questão
The percentage of UV light reaching Earths surface from the total solar spectrum is:
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10%
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50%
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1%
Questão 37
Questão
IR rays are:
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Electromagnetic radiation
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Flux of protons
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Flux of electrons
Questão 38
Questão
The main effect of IR rays is:
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Bactericidal
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Thermal
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Photo-stimulating
Questão 39
Questão
The energy of IR is higher than that of:
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Radio-waves
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Visible Light
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UV rays
Questão 40
Questão
The IR electromagnetic spectrum has wavelength range of:
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10 - 400nm
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380 - 760 nm
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0.76 - 1000 µm
Questão 41
Questão
Band A of IR radiation is :
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0.76 µm - 2.5 µm
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0.25 µm - 50 µm
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50 µm - 1000 µm
Questão 42
Questão
Band B of IR radiation is :
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0.76 µm - 2.5 µm
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2.5 µm - 50 µm
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50 µm - 1000 µm
Questão 43
Questão
Band C of IR radiation is :
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0.76 µm - 2.5 µm
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2.5 µm - 50 µm
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50 µm - 1000 µm
Questão 44
Questão
Which type of life is NOT fully absorbed in water:
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UV
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Visible Light
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IR
Questão 45
Questão
Thermography is diagnostic imaging method which is:
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Absolutely harmless
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With a high resolution
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With diagnostic value greater than that of MRI
Questão 46
Questão
Thermography uses:
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IR rays
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UV rays
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Radiopharmaceuticals
Questão 47
Questão
Emission spectrum of the human body is in the:
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Red end of visible spectrum
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UV range
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IR range
Questão 48
Questão
IR rays do NOT have application in:
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Toxicology, for finding traces of toxins in tissues
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Forensic medicine, for night photography
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In Thermography
Questão 49
Questão
What is the approximate IR power emitted from the human body in room temperature:
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50mW
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50W
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5 W
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