Properties of Waves and Sound
Ever wondered why dropping a stone in water creates ripples that spread outward? Waves are oscillations (vibrations) that transfer energy from one place to another, just like those ripples carrying energy across the water's surface.
There are two main types of waves you need to know. Transverse waves have oscillations at right angles to the direction energy travels - imagine waving a rope up and down. Longitudinal waves have oscillations parallel to energy transfer - like pushing and pulling a spring back and forth.
Sound waves are always longitudinal, which means they create areas of compression (particles squashed together) and rarefaction (particles spread apart). Sound can't travel through a vacuum because it needs particles to vibrate - that's why space is completely silent! The speed of sound varies depending on what it's travelling through: 340 m/s in air, 1500 m/s in water, and a whopping 5000 m/s in steel.
The amplitude of a sound wave determines how loud it is - bigger amplitude means louder sound. Meanwhile, frequency (how many waves pass a point per second) controls the pitch - higher frequency creates higher pitched sounds.
Quick Tip: Remember that sound travels much faster through solids than gases because the particles are closer together and can vibrate more efficiently!
