• benderbeerman@lemmy.world
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    2 months ago

    .30-06 muzzle velocity of 3140fps with maximum effective range of 600yards.
    Speed of sound@1026fps.

    Commanders head explodes, then about a second or two later he hears an unintelligibly high pitched, very short whistle blast.

    Poor Chinese guy thinks the Mongols and their whistling arrows are back to tear down that shitty wall again.

    • too_high_for_this@lemmy.world
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      2 months ago

      Nah, you’d hear a crack from the bullets sonic boom, then immediately you’d hear the whistling in reverse and pitched down, followed by the pop from the gun.

      The Doppler effect explains why pitch is higher for, say, an ambulance heading towards you, but as you approach the speed of sound, the sound waves all bunch up together and you’d just hear a sharp blast.

      Faster than that and the sound waves created have to catch up. At 2x SoS, it would be the same pitch in reverse. Faster than that and the pitch drops.