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Electromagnetic Radiation
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MULTIPLE CHOICE
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1. The four properties of photons are ____, ____, ____, and ____.
size, shape, spin, frequency, mass, amplitude, wavelength frequency, wavelength, velocity, amplitude refraction, velocity, spin, amplitude
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ANS: C The properties of photons are frequency, wavelength, velocity, and amplitude
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The smallest quantity of any type of electromagnetic radiation is a(n) ____.
Photon Electron Neutrino quark
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ANS: A The smallest quantity of any type of electromagnetic radiation is a photon.
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What is the velocity of all electromagnetic radiation?
8 ´ 103 m/s 2 ´ 108 m/s 3 ´ 108 m/s 4 ´ 103 m/s
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ANS: C The velocity of all electromagnetic radiation is 3 ´ 108 m/s.
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The rate of rise and fall of a sine wave is called its ____.
Amplitude Frequency Wavelength Velocity
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ANS: B The rate of rise and fall of a sine wave is called its frequency.
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A hertz (Hz) is equal to 103 cycles per second 102 cycles per second
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ANS: D A hertz is equal to 1 cycle per second
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What is the electromagnetic wave equation?
c = fë c = f/ë c = fv c = f – ë
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ANS: A The wave equation is v = fë
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The ____ of electromagnetic radiation is constant.
Amplitude Velocity Frequency Wavelength
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ANS: B The velocity of electromagnetic radiation is constant.
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If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must Double increase four times decrease by half remain constant
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ANS: C If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must decrease by half.
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The intensity of radiation ____ in ____ proportion to the square of the distance of the object from the source. increases, direct decreases, direct increases, inverse decreases, inverse
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ANS: D The intensity of radiation decreases in inverse proportion to the square of the distance of the object from the source.
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The reduction of radiation intensity due to scattering and absorption is called ____.
Reflection refraction Attenuation Dispersion
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ANS: C The reduction of radiation intensity due to scattering and absorption is called attenuation.
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The intensity of radiation on an object is reduced with distance because the radiation
reduces its velocity increases in wavelength Loses its energy Is spread out over a greater area
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ANS: D The intensity of radiation on an object is reduced with distance because the radiation is spread out over a greater area.
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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? 0.4 millilumens 1 millilumen 2 millilumen 16 millilumen
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ANS: B 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.
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The energy of a photon is directly proportional to its
Amplitude Frequency Velocity Wavelength
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ANS: B The energy of a photon is directly proportional to its frequency.
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The mass equivalent of a 100 KeV photon of radiation can be calculated using the
inverse square formula equivalent Planck equation relativity formula Planck quantum equation
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ANS: C The mass equivalent of a 100 KeV photon of radiation can be calculated using the relativity formula.
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X-rays are usually identified by their ____.
Energy Velocity Wavelength hertz
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ANS: A X-rays are usually identified by their energy.
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The lowest energy range of the electromagnetic spectrum is
sound waves radio waves gamma rays microwaves
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ANS: B The lowest energy range on the electromagnetic spectrum is radio waves.
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Gamma rays are produced in the ____ of the atom.
outer electron shell inner electron shell nucleus K-shell
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ANS: C Gamma rays are produced in the nucleus of the atom.
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Photons tend to interact with matter ____ its wavelength.
equal in size to Larger in size than Smaller in size than Unequal in size to
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ANS: A Photons tend to interact with matter equal in size to wavelength.
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Photons with the highest frequencies have the
highest velocity lowest energy Longest wavelength Shortest wavelength
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ANS: D Photons with the highest frequencies have the shortest wavelengths. Photons with the highest frequencies have the shortest wavelengths.
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