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11. Magnetic field exerts a force on a charged particle: inizia ad imparare
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12. What magnetic field cannot inizia ad imparare
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Cannot change the kinetic energy of a charge
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13. Electrons are going around a circle in a counterclockwise direction. They produce a magnetic field whose direction at the center of the circle is: inizia ad imparare
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14. The spin magnetic moment of an electron is: inizia ad imparare
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The magnetic moment induced by the spin of elementary particles. The electron spin magnetic moment is given by the formula
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15. What Lenz' law is explaining inizia ad imparare
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Lenz's law gives the direction of the induced electromotive force (emf) and current resulting from electromagnetic induction
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16. The permeability constant Km for typical paramagnetic substance is: inizia ad imparare
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17. The permeability constant Km for a typical diamagnetic substance is: inizia ad imparare
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18. Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic ferromagnetic) which are used to make paramagnet magnets inizia ad imparare
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19. When a permanent magnet is strongly heated; inizia ad imparare
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It loses its magnetism...
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20. During radioactive alpha decay in uranium: inizia ad imparare
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The nucleus are emitted from nucleus of uranium atom
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21. Which types of electromagnetic radiation travels at the greatest speed in vacuum? inizia ad imparare
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X-ray, gamma waves, radio waves and visible light
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22. For an electromagnetic wave the direction of the vector E times B gives: inizia ad imparare
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The direction of wave propagation
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23. The time averaged energy in a sinusoidal electromagnetic wave is: inizia ad imparare
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Equally divided between the electric and magnetic fields
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24. When x-rays pass through the medium because of absorption the intensity: inizia ad imparare
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25. Absorption x-rays depend on: inizia ad imparare
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Wave wavelength and properties of material
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26. Scattering index of light is: inizia ad imparare
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Ratio between light speed in vacuum and medium
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27. Considering human eye refraction of light ray occurs: inizia ad imparare
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28. In convex lens ray which is parallel to axis after refraction goes through: inizia ad imparare
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inizia ad imparare
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It is Snell's law of light refraction
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30. With increase of fluid speed the internal pressure: inizia ad imparare
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31. With increase of fluid viscosity: inizia ad imparare
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Fluid volume flow rate decreases
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32. According to Poiscuille's law if to decrease radius of pipe twice: inizia ad imparare
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Volume flow rate decrease 16 times
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33. Harmonic oscillations of air gives: inizia ad imparare
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34. Spectrum of sound is: inizia ad imparare
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Sound intensity dependence on frequency
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inizia ad imparare
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36. Height of sound depend on inizia ad imparare
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inizia ad imparare
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38. If source of sound approaches detector inizia ad imparare
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39. If detector approaches source of sound inizia ad imparare
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inizia ad imparare
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X-ray are produced when electrons are stopped at the surface of anode
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41. Coherent scattering of x-ray is: inizia ad imparare
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Is not ionizing radiation and have not biological effect
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42. In x-ray tube electron are emitted from cathode because of inizia ad imparare
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43. What is the action between two positively charged particles inizia ad imparare
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44. Superposition principle for the electric field means: inizia ad imparare
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That resultant electric field is equal to the vector sum of individual electric fields
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45. Coulomb's law describes: inizia ad imparare
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The electrostatic force F between two charged particles separated by a distance
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46. How are equipotential lines directed according to electric field lines: inizia ad imparare
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Equipotential and electric field lines are perpendicular to each other
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47. What phenomenon is described as electrophoresis: inizia ad imparare
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Migration of electrically charged particles in electrolic solution under the influence of electric field
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48. What system is defined as electric dipole: inizia ad imparare
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A system of two equal and opposite point charges separated by a small distance
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49. What is electric current unit in SI system: inizia ad imparare
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50. Which expression for current density is correct: inizia ad imparare
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51. What is defined as mobility of ions: inizia ad imparare
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Velocity of electric particle under the unit electric field
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52. The total resistance of living tissue to electric current is due to inizia ad imparare
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Ohmic resistance and capacitance
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53. How does sensitivity of human body to electric shock change for high frequency current inizia ad imparare
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54. The nernst equation expresses: inizia ad imparare
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The equilibrium voltage associated with a concentration ratio of one kind of ions
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55. Goldman-Hodgkin-Kitz equation expresses: inizia ad imparare
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The equilibrium voltage with a concentration of three kinds of ions
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56. Action potential can be generated during: inizia ad imparare
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Excitatory stimulation on the top of inhibitory stimulation of the same amplitude
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57. What influence does myelin sheath have to excitation conduction velocity:? inizia ad imparare
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Increases conduction velocity
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58. What is an electrocardiogram (ECG)? inizia ad imparare
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Potential difference between two points of human body recorded over time
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59. What corresponds to two opposite charges in ECG dipole model: inizia ad imparare
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Excited and resting areas of the heart
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60. Weiss-Lapisque relationship is between: inizia ad imparare
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Minimal current of stimulation to excite the tissue and duration of stimulation
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