ulrasonic wave

2011-04-11 11:26 am

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Please explain statement one and three!

回答 (1)

2011-04-12 4:50 am
✔ 最佳答案
Statement (1): the wavelength of ultrasound wave is much shorter than audible sound. Hence, various noises, e.g. sound produced by propellers of ships, would not cause interference to the ultrasound.

Statement (3): as said above, ultrasound wave has a much shorter wavelength, diffraction effect could well be avoided. Hence, object with small dimension can be detected.


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