څپې څه دي، غږ څنګه خپرېږي او ولې لښته په اوبو کې ماته ښکاري — له تعاملي سمولېشنونو سره.
Waves are everywhere: ripples on the Qargha reservoir, the call to prayer carried across the city, the light from the sun and the radio signal on your phone. This course builds one idea — a wave carries energy without carrying matter — and applies it to sound and light.
