Why is there no sonic boom when shooting an air rifle at 1400 feet per second?

  • Context: Undergrad 
  • Thread starter Thread starter curtmorehouse
  • Start date Start date
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Discussion Overview

The discussion revolves around the phenomenon of sonic booms, specifically in the context of shooting an air rifle that fires projectiles at a speed of 1400 feet per second. Participants explore the conditions under which sonic booms occur, the perception of sound generated by bullets, and the differences between supersonic and subsonic ammunition. The conversation includes technical explanations, conceptual clarifications, and personal observations regarding sound propagation and shockwaves.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants note that the speed of sound in air at 20 degrees Celsius is approximately 1126 feet per second, leading to questions about why a bullet traveling at 1400 feet per second does not produce a sonic boom.
  • One participant suggests that the noticeable crack heard when firing a rifle may not be the sonic boom of the bullet itself, but rather the sound of the explosion at the barrel.
  • Another participant argues that the shooter is positioned within the shockwave cone, which may prevent them from hearing the sonic boom as it does not reach their ears.
  • There is a discussion about the sounds associated with supersonic bullets, with some participants describing them as producing a whistling sound rather than a distinct boom.
  • Participants discuss the characteristics of sound generated by bullets, noting that smaller, fast-moving projectiles may create high-pitched sounds due to their size and speed.
  • Some participants assert that sonic booms are a result of an object traveling faster than the speed of sound, regardless of whether the object emits sound on its own.
  • There is contention regarding the nature of sonic booms, with some arguing that they do not have a pitch and others suggesting that the sound produced can vary based on the object's characteristics.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the nature of sonic booms, the perception of sound from bullets, and the conditions necessary for a sonic boom to be heard. The discussion remains unresolved with no clear consensus on several points.

Contextual Notes

Participants highlight various assumptions about sound propagation, the geometry of shockwaves, and the conditions under which different types of ammunition produce distinct sounds. There are references to the effects of distance and environmental factors on sound perception.

  • #31
boneh3ad said:
I already admitted in a previous post that some of both what I said and the way I said it was inaccurate. I take back what I said about a shock retaining frequency information from the sound wave generated by the object. That was misguided.
So you might call it an "educated guess"...
 

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