actually added physics waves:

diff --git a/physics/waves.md b/physics/waves.md
new file mode 100644 (file)
index 0000000..92cf75d
--- /dev/null
+++ b/physics/waves.md
@@ -0,0 +1,24 @@
+# Waves
+
+## Longitudinal and Transverse Waves
+
+Longitudinal - direction of motion parallel to wave
+Transverse - direction of motion perpendicular to wave
+
+
+## Wavelength & frequency
+
+
+$$v=f \times \lambda$$
+
+
+Nodes - point of no motion
+Antinodes - point of maximum motion (peaks)
+
+Crests (peaks) & troughs (azimuths)
+
+
+
+## Interference patterns
+
+Standing wave - constructive interference at resonant frequency