End Matter

Image Credits

• Fig.

  1.1 © V. Blacus, https://commons.wikimedia.org/wiki/File:Electromagnetic-Spectrum.svg,
  CC BY SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0/).

• Fig.

  1.2: © Y. Qin, https://commons.wikimedia.org/wiki/File:M0074_fClap.svg,
  CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

• Fig.

  1.3: © Y. Qin, https://commons.wikimedia.org/wiki/File:M0074_fTrumpet.svg,
  CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).