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Electromagnetic Radiation

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Presentation on theme: "Electromagnetic Radiation"— Presentation transcript:

1 Electromagnetic Radiation

2 MULTIPLE CHOICE

3 1. The four properties of photons are ____, ____, ____, and ____.
size, shape, spin, frequency, mass, amplitude, wavelength frequency, wavelength, velocity, amplitude refraction, velocity, spin, amplitude

4 ANS: C The properties of photons are frequency, wavelength, velocity, and amplitude

5 The smallest quantity of any type of electromagnetic radiation is a(n) ____.
Photon Electron Neutrino quark

6 ANS: A The smallest quantity of any type of electromagnetic radiation is a photon.

7 What is the velocity of all electromagnetic radiation?
8 ´ 103 m/s 2 ´ 108 m/s 3 ´ 108 m/s 4 ´ 103 m/s

8 ANS: C The velocity of all electromagnetic radiation is 3 ´ 108 m/s.

9 The rate of rise and fall of a sine wave is called its ____.
Amplitude Frequency Wavelength Velocity

10 ANS: B The rate of rise and fall of a sine wave is called its frequency.

11 A hertz (Hz) is equal to 103 cycles per second 102 cycles per second

12 ANS: D A hertz is equal to 1 cycle per second

13 What is the electromagnetic wave equation?
c = fë c = f/ë c = fv c = f – ë

14 ANS: A The wave equation is v = fë

15 The ____ of electromagnetic radiation is constant.
Amplitude Velocity Frequency Wavelength

16 ANS: B The velocity of electromagnetic radiation is constant.

17 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

18 ANS: C If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must decrease by half.

19 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

20 ANS: D The intensity of radiation decreases in inverse proportion to the square of the distance of the object from the source.

21 The reduction of radiation intensity due to scattering and absorption is called ____.
Reflection refraction Attenuation Dispersion

22 ANS: C The reduction of radiation intensity due to scattering and absorption is called attenuation.

23 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

24 ANS: D The intensity of radiation on an object is reduced with distance because the radiation is spread out over a greater area.

25 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

26 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.

27 The energy of a photon is directly proportional to its
Amplitude Frequency Velocity Wavelength

28 ANS: B The energy of a photon is directly proportional to its frequency.

29 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

30 ANS: C The mass equivalent of a 100 KeV photon of radiation can be calculated using the relativity formula.

31 X-rays are usually identified by their ____.
Energy Velocity Wavelength hertz

32 ANS: A X-rays are usually identified by their energy.

33 The lowest energy range of the electromagnetic spectrum is
sound waves radio waves gamma rays microwaves

34 ANS: B The lowest energy range on the electromagnetic spectrum is radio waves.

35 Gamma rays are produced in the ____ of the atom.
outer electron shell inner electron shell nucleus K-shell

36 ANS: C Gamma rays are produced in the nucleus of the atom.

37 Photons tend to interact with matter ____ its wavelength.
equal in size to Larger in size than Smaller in size than Unequal in size to

38 ANS: A Photons tend to interact with matter equal in size to wavelength.

39 Photons with the highest frequencies have the
highest velocity lowest energy Longest wavelength Shortest wavelength

40 ANS: D Photons with the highest frequencies have the shortest wavelengths. Photons with the highest frequencies have the shortest wavelengths.


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