Electromagnetic Waves

Topics in this chapter

• Displacement Current and Maxwell Law
• EM Wave Fields and Propagation
• Wave Speed, Frequency and Refraction
• EM Wave Energy and Momentum
• Electromagnetic Spectrum and Applications
• Atmospheric Effects of EM Radiation

Cheat sheet

Practice questions

1. Question 1Q-B09EE4

   Which of the following electromagnetic waves is produced by the decay of radioactive nuclei?

   1. A.X-rays
   2. B.Gamma rays
   3. C.Ultraviolet rays
   4. D.Infrared waves
   See the answer and solution
2. Question 2Q-C14B9F

   The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $B_0 = 510 \text{ nT}$. What is the amplitude of the electric field part of the wave?

   1. A.153 N/C
   2. B.306 N/C
   3. C.1.7 N/C
   4. D.510 N/C
   See the answer and solution
3. Question 3Q-18AF65

   If the earth were without an atmosphere, what would be the average temperature of its surface?

   1. A.Higher than the present temperature
   2. B.Same as the present temperature
   3. C.Lower than the present temperature
   4. D.0 degrees Celsius
   See the answer and solution
4. Question 4Q-373373

   Light with an energy flux of $18 \text{ W/cm}^2$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \text{ cm}^2$, the total momentum delivered to the surface during a span of 30 minutes is:

   1. A.$1.08 \times 10^{-3} \text{ kg m/s}$
   2. B.$3.24 \times 10^{-3} \text{ kg m/s}$
   3. C.$6.48 \times 10^{-3} \text{ kg m/s}$
   4. D.$2.16 \times 10^{-4} \text{ kg m/s}$
   See the answer and solution
5. Question 5Q-6BE43C

   Which of the following physical quantities is NOT transported by electromagnetic waves?

   1. A.Energy
   2. B.Momentum
   3. C.Charge
   4. D.Information
   See the answer and solution