More on Waves

Standing Waves A standing wave is produced by the interference of 2 periodic waves traveling in opposite directions and in the same medium The waves must have the same frequency, wavelength and amplitude

Standing Waves

Standing Waves Nodes – points in medium where the displacement is always zero (constant perfect destructive interference) Distance between adjacent nodes - Antinodes – points in medium of maximum displacement Distance between adjacent antinodes -

Huygen’s Principle Christian Huygen’s Every point on an advancing wave front can be considered as a secondary source at which circular wavelets, like those sent out from a point source, originate. The new wave front can be found by drawing the line tangent to all of these wavelets at a slightly later instant

Huygen’s Priniciple

Huygen’s Principle Applet showing Principle and it’s application to reflection and refraction Huygen’s Principle HP and diffraction: