Placeholder Image

Subtitles section Play video

  • Quantum mechanics is weird, right? But did you know that some of its supposed peculiarities

  • are not unique to quantum physics but are just properties of waves in general?

  • Take the uncertainty principle - it says that the better we know where a particle is, the

  • less we know about how fast it's going. There's a limit to how much we can know! But this

  • isn't just quantum weirdness - it happens all the time with normal everyday waves!

  • Remember that the frequency of a wave is how close the wave crests are to each other - a

  • low frequency wave doesn't have nearly as much oomph as a high frequency one!

  • And the position of a wave iswell, where the wave ismostly. So where exactly is

  • a wave? It's spread out everywhere, right? Ok, but for a wave pulse it's pretty easy

  • to see where the wave is. So now that we know where the pulse is, what's it's frequency?

  • Well, a localized pulse doesn't really "wave", so we can't measure the frequency of its crests!

  • And that's the uncertainty principle in a nutshell - you can either know where a wave

  • is or where it's going, but not both at the same time!

Quantum mechanics is weird, right? But did you know that some of its supposed peculiarities

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B1 wave frequency quantum pulse uncertainty principle

What is the Uncertainty Principle?

  • 1292 74
    fisher posted on 2013/04/12
Video vocabulary