Doppler Effect with Car Horn

The Doppler Effect-the sound of coming and going: When a source of sound is moving toward you, successive wavefronts arrive more frequently. You perceive this increase in frequency as a higher tone. Conversely, if the source of sound is moving away from you, the time between wavefronts reaching you is a little longer and this decrease in frequency is perceived as a lower tone.

[@Gretchaninov]

I used this for my Year 11 physics class. We estimated the frequencies of the horn before and after as 390Hz and 350Hz and calculated the speed of the car as about 66km/h using the Doppler effect formulas.

[@NatSciDemos]

Pretty good!

[@rapperpankajsingh2880]

F'=(330+-vO)/(330-Vs) F sorry don't know too much i am medical NEET aspirant

[@gohilramdevrajeshbhai5254]

I too did this but I found his speed as around 73 miles/hour (33m/s) . Horn frequency when at rest is 355Hz. Max frequency detected was 393Hz. Minimum frequency detected was 343 Hz. Taking speed of sound as 343 m/s, the results says he was lying and driving at faster speed. The discrepancies can also be due to my view that he was not driving at constant speed but rather accelerating and retarding! Geek!

[@Gretchaninov]

@@gohilramdevrajeshbhai5254 The 355Hz figure is for when the car is moving away, not at rest. Whether the car was accelerating or not, it couldn't change much speed from just before and just after it passes the camera and the sound changes. You can still get a good estimate of the speed from that. And it seems clear that its speed isn't changing much from the video.

[@Bigvs.Dickvs]

Don't *EVER* cut the way of a Physics Engineer while driving, he will blast his Doppler gun at your hears!

[@joemicka5222]

This is the first time I have noticed it so clearly, very cool!

[@MrFerrari458gto]

Poor dood running probably like wtf😂

[@Bigvs.Dickvs]

Harvard has just peer reviewed my lifetime research as a car driver.

[@ThuNguyen-jy2jt]

this guy needs to get more views. this quality is on par with some of the biggest vlogging youtubers. great educational video too.

[@GatoAstronauta]

*"Yeah, Science!!!"* 👏🏽👌🏾👍🏼

[@gregbernstein7524]

"Stunt Driver"

[@bratishka3082]

Yes, I can see Dopler effect. There is obvious blueshift in car roadlights

[@ProfAndrey]

0:26 Stationary horn 0:48 Moving horn

[@lincolnkarim1]

The Doppler Effect and Stockholm Syndrome all in one package.

[@abpccpba]

Where is the Train? 🙂

[@Bigvs.Dickvs]

If you suffer from road rage, you might qualify to study Physics!

[@sandhyarahangdale6457]

0:49

[@user-sr6pi5lp3q]

Car speed?

[@Cryptic_Triptych]

Can you please mount the horn on the rear of the car, facing away from the car, and do this experiment again?

[@coar]

Are you reviewer #2?

[@exiledproductions956]

Would that sound different if the horn was in the back of the car? In a way I know it wouldn't but it seems like it would at the same time. So....???

[@NatSciDemos]

It would sound the same.

[@exiledproductions956]

​​@@NatSciDemos so the dopler effect is from the noise getting closer and further not where the sound is necessarily happening?

[@aclshopper1392]

Bro

[@Geotrax2]

Sound go slow down

[@highbloxplayz7186]

When you have nothing to do but waste your time be like:

[@pyro934]

When you’re a kid be like: