3 ms·

> The signal, at 37.5 kHz per second, was picked up by a black box locator at 25 degrees south latitude and 101 degrees east longitude. Hz per second? Hertz i

• Nogwater 13y ago
  Maybe it's an accelerating frequency, like a chirp? :)
• ericbarch 13y ago
  I think they're referring to the fact that it sends the pulse once per second. Could have been worded differently.
  • PakG1 13y ago
    "each second" perhaps.
    • ttflee 13y ago
      Yes, it should have been translated as "once per second." Perhaps the "每秒一次"(once per second) was abbreviated to "每秒"(per second) somewhere in the news report.
• wglb 13y ago
  Yep, but they did get it right a little further down the article. But what is the monitor an acoustic wave--isn't it a radio signal?
  • dannypgh 13y ago
    No, it's an acoustic wave. Salt water is a good conductor of electricity, as such only ultra low frequency radio has any chance of penetrating more than a few feet, and the antenna needed to pull that off is prohibitively large for an aircraft. Recommended reading: http://en.m.wikipedia.org/wiki/Communication_with_submarines http://en.m.wikipedia.org/wiki/Communication_with_submarines
  • mikeash 13y ago
    Radio doesn't penetrate water well. It also emits sonar pings for the case where it's in water.