Name: 為什麼超聲要用在聲納上？| 為什麼要在聲納中使用超聲？ (Why is ultrasound used in sonar? | #aumsum)
Uploaded: 2021-01-14T08:10:46.000Z
Duration: 2 min 35 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Looks like you are searching for a treasure hidden in a sunken ship.

It will emit ultrasounds and help you locate the ship.

I know that the music system is the right choice.

Do you know how a sonar could locate the sunken ship?

Ultrasounds are sounds having very high frequencies which start from 20,000 Hertz.

So, is ultrasound used in sonar because of its high frequency?

Due to its high frequency, an ultrasound can penetrate to a greater depth.

Thus helping us to locate the depth of the sea, sunken ships, etc.

But, I am not able to hear the ultrasound?

It is because human beings can hear sound frequencies from 20 Hertz to 20,000 Hertz.

As ultrasounds have frequencies higher than 20,000 Hertz, we cannot hear them.

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為什麼超聲要用在聲納上？| 為什麼要在聲納中使用超聲？ (Why is ultrasound used in sonar? | #aumsum)

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