Recent content by thefortyseven

All sorted now, thanks for the help and information everyone, much appreciated.

I think rcgldr was referring to the table at the bottom of the Wiki Sound Pressure page. By mirror image I mean that in the USS Iowa image and rcgldr's second video, the effect produced on the water, is that the shockwave coming into contact with the water? Or is it the result of another...

I'll be honest, I'm not entirely sure what a concussion wave is either... I'd presumed it was merely a disturbance caused by a violent explosion or event, causing vibrations in a medium (but not traveling fast enough to be classed a shockwave). I also agree that the wave is being produced by...

Yep, I think we can agree it's not the result of the projectile fired from the cannon. See, my problem is that a shockwave should be in a sort of cone protruding back, as seen here: http://dev.physicslab.org/Document.aspx?doctype=3&filename=WavesSound_BarrierWaves.xml How can a relatively...

Interesting. So, perhaps in that USS Iowa image, the initial wave produced by the cannon blast is a shockwave, but as it loses energy and dissipates over the water it becomes a regular (or concussion) wave. Would you say that's about right?

Thanks rcgldr, those videos help clarify the effects of a shockwave. I agree, though, that it's difficult to tell in the USS Iowa image what sort of wave is being produced, hence my confusion as various places have identified it as a shockwave (although the official US Navy caption for the image...

Thanks for the reply. I'd read that definition before but I had some issue with it. It seemed oddly explained and the following statement, "In particular, shock waves travel faster than sound, and their speed increases as the amplitude is raised" , isn't true (I think), as the waves...

Hi all, Long time reader of Physics Forums but first time posting. Anyway, I work for a national magazine, and we are running an article on "Shockwaves". For the picture in the article we are using the attached image (or link here http://commons.wikimedia.org/wiki/File:Uss_iowa_bb-61_pr.jpg)...