In vacuum, or even atmosphere, not that many things can change

送交者: steven 于 2014-04-08, 14:22:49:

回答: 和方位的变化有关系吧由 conner 于 2014-04-08, 12:34:06:

the frequency of electromagnetic wave. So the only thing left is direction of movement. For sound wave, the movement of medium, the temperature, all these will change the frequency, how can you isolate all those factors?

所有跟贴:

sound or Em doesn't matter. the source is not moving what does doppler show? (无内容) - pgss (0 bytes) 2014-04-09, 12:00:12 (745733)
Are you sure the temperature can change the frequency ? - saas (181 bytes) 2014-04-08, 19:42:29 (745684)
- It changes the density of water, of course, that changes the frequency. (无内容) - steven (0 bytes) 2014-04-08, 21:03:29 (745687)
  - termperature changes speed, freq remains unchanged - pgss (14 bytes) 2014-04-09, 12:01:42 (745734)
    - this is neither ideal gas, no homogenous either. - steven (237 bytes) 2014-04-09, 13:47:16 (745742)
      - doesnt matter, the key is, freq remains unchanged (无内容) - pgss (0 bytes) 2014-04-10, 19:55:02 (745835)
  - think again and avoid using of course (无内容) - 008 (0 bytes) 2014-04-08, 21:50:35 (745689)
    - Blah, blah, blah... (无内容) - steven (0 bytes) 2014-04-08, 23:18:45 (745694)
then how can you locate the blackbox even with constant signal? (无内容) - ASH (0 bytes) 2014-04-08, 14:57:46 (745639)
- same as u in hide-n-seek, move around and compare change in intensity (无内容) - pgss (0 bytes) 2014-04-09, 12:02:51 (745735)
- It is never easy. Typically, they see if they can triangulate. - steven (91 bytes) 2014-04-08, 15:10:49 (745642)

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