Yes, you can measure the speed of sound with your phone. Hey folks, this is Sebastian and I'm here today with our PhD student Simon. Hey there. And I would try to keep this video short because this is a really simple experiment. If you work in pairs in a quiet place, all you need is two phones and a tape measure. You will need three fox on both phones, which you can get for free from freefox.org. On both phones, open up the acoustic stopwatch and start the measurement. Increase the threshold until the background noise does not trigger the stopwatch anymore. Then place the phones a few meters apart and measure their distance. Each of you should reset the stopwatch and then both of you just need to clap one at a time. The sound from the clap starts both watches. The one close to the clap will start first, while the other one will start at the delay given by the distance between both phones divided by the speed of sound. The second clap will stop the watches again. This time, the other watch stops immediately, followed by the first one at the same delay. So the difference in the measure time of both watches will be twice the delay and you can calculate the speed of sound easily. Two times the distance divided by the difference in the measure times. So that's it for this experiment. We've got 370 meters per second. It's a little high, but it's a simple experiment. So now it's your time to try it. Thanks for watching and see you soon in the next video. Thanks for watching.