Standing Waves What we already know Standing Waves

Standing Waves • What we already know • Standing Waves • Nodes and Antinodes • Check Your Understanding • Harmonics

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Recall • _________ • This reflection will be an inverted version of the incoming wave.

What we already know • Waves can interfere with each other, either Constructively or Destructively.

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Nodes and Antinodes • ________ • The nodes are spaced ½ a wavelength from each other – Therefore ……………. . • Areas which contain our supertroughs and supercrests are called the antinodes

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Check Your Understanding The distance between the second and fifth nodes in a standing wave is 59 cm. What is the wavelength of the waves in cm? What is the speed of the waves if the source has a frequency of 25 Hz in cm/s?

Standing Waves – Scientific and Musical Names • Name given to standing wave patterns • As the frequency increases, more nodes and antinodes are formed • ………………. . Number of Loops Number of Nodes Number of Antinodes Scientific Name Musical Name 1 2 1 First Harmonic Fundamental 2 3 2 Second Harmonic First Overtone 3 4 3 Third Harmonic Second Overtone

Standing Wave Harmonics First Harmonic Second Harmonic Third Harmonic