• M137@lemm.ee
    link
    fedilink
    arrow-up
    3
    arrow-down
    12
    ·
    1 year ago

    Did you consciously try to make yourself look as dumb as possible?

    • Jojo@lemm.ee
      link
      fedilink
      arrow-up
      6
      ·
      1 year ago

      They’re just not moving fast enough, or possibly in the right direction.

      • neumast@lemmy.world
        link
        fedilink
        arrow-up
        11
        ·
        edit-2
        1 year ago

        Sooooo, wavelengths (λ) become longer when something moves away (redshift) and become shorter when something moves towards you (blueshift).

        For a red flag (λ0=610nm) to become a green flag (λ1=549nm), it has to move towards you quite fast. But how fast is ‘quite fast’?

        Using the formula

        flag_velocity / speed of light © = difference in wavelengths / starting wavelength

        we get

        flag_velocity = (610-549) / 610 * c = 61 / 610 * c = 1/10 * c

        This means: the flag has to move with about c/10 = 30 000 000 m/s = 108 000 000 km/h = 67 108 100 mph. Yeah, that’s quite fast.

        (Disclaimer:

        1. use info on own risk

        2. values for λ were chosen in a way to make calculations easy. There is no info on what shade of red or green the flag is. The final result will be about the same.

        3. With speeds at around 10% of c, I should use the formula considering the relativistic doppler effect… However, i wont. Thanks.)

        • Dave.@aussie.zone
          link
          fedilink
          arrow-up
          5
          ·
          edit-2
          1 year ago

          pssst hey you missed the conversion from seconds to hours, your answers are in kilometres/miles per second and need to be another 3600 times larger.

          • neumast@lemmy.world
            link
            fedilink
            arrow-up
            2
            ·
            1 year ago

            Are you sure about that? From m/s to km/h you multiply by 3600 (for the time) and divide by 1000 (for the distance) which leads to a factor of 3.6.

            Personally i always remember 25 m/s = 90 km/h = 56 mph because of the somewhat round numbers.

        • Jojo@lemm.ee
          link
          fedilink
          arrow-up
          4
          ·
          1 year ago

          Well, instead of moving the flag, we could collapse the space in between us rapidly. Would that be easier? I think I have some dark energy around here somewhere…

    • muntedcrocodile@lemmy.world
      link
      fedilink
      arrow-up
      1
      ·
      1 year ago

      Just checked ur comment history and i think ur a little insecure about ur intelegence. Dont worry ill let u have the last word.