How Does Doppler Effect in One Minute -- #VeritasiumContest Work?

Imagine you're on a merry-go-round, and your friend is shouting at you from outside, when you're moving toward them, their voice sounds louder and higher, but when you move away, it sounds softer and lower. That’s the Doppler Effect!

Think about a train blowing its whistle as it comes toward you. The sound waves get squished together, like crushed soda cans, making the pitch higher. Once the train passes you and starts moving away, the sound waves stretch out, just like when you pull apart a rubber band, making the pitch lower.

This happens with sound, but it also works with light! When stars move toward us, their light shifts to blue (higher energy), and when they move away, it shifts to red (lower energy). Scientists use this trick to figure out how fast stars are moving, like using a cosmic speedometer!

So next time you hear a siren or see a colorful sky, remember: it’s the Doppler Effect playing its little tune! 🎵