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SSS 2010-08-09

时间:2010-09-03 03:03来源:互联网 提供网友:yu6707   字体: [ ]
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Blue whales off the California coast make calls that, sped up 10 times, sound like (sound of two-part call). The original is a wall-rattling frequency too low for us to hear. Scientists analyzed1 around 2,500 of those calls, and found that the second part (sound) is nearly identical in pitch every time from each whale: 16 hertz, or four octaves below middle C. And the slight variations in frequency that do exist are only a tenth of the difference between a C and a C sharp. Those findings appear online in the Journal of the Acoustical2 Society of America.

The researchers don't know how many different individual whales they caught singing, or why even they sing at all. But past studies suggest only blue whale males make calls like this. So the investigators3 speculate that males might synchronize4 to a single common pitch as a sort of mating beacon5.

Thanks to the Doppler effect, females swimming towards a male would hear a slightly higher pitch; swimming away, a lower-pitched moan. Serenade out of tune—you might be swimming solo tonight.

Thanks for the minute. For Scientific American's 60-Second Science, I'm Christopher Intagliata.
 


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1 analyzed 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
2 acoustical acoustical     
adj. 听觉的,声学的,音响学的
参考例句:
  • This system can set up acoustical resonances. 这种系统能产生共鸣。
  • The relevance of acoustical principles is by no means limited to sound and hearing. 声学原理并不仅仅适用于声音和听觉。
3 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
4 synchronize Lqlwy     
v.使同步 [=synchronise]
参考例句:
  • The sound on a film must synchronize with the action. 影片中的声音必须与动作配合一致。
  • You must synchronize your Inbox before selecting additional folders. 在选择其他文件夹前,您必须同步您的收件箱。
5 beacon KQays     
n.烽火,(警告用的)闪火灯,灯塔
参考例句:
  • The blink of beacon could be seen for miles.灯塔的光亮在数英里之外都能看见。
  • The only light over the deep black sea was the blink shone from the beacon.黑黢黢的海面上唯一的光明就只有灯塔上闪现的亮光了。
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