Science Proved on Instagram: "🚗🔊 The Doppler Effect in Real Life 💡 Ever noticed how an ambulance siren sounds higher as it approaches and suddenly lower as it moves away? That’s the Doppler effect. When a sound source moves toward you, the waves get compressed, raising the pitch. As it moves away, the waves spread out, lowering the pitch. From sirens and race cars to stars and galaxies, the Doppler effect helps us understand motion across the universe 🌌 Follow @scienceproved for more! Credit