In this , ship transmitter produce ultrasonic sound ( which human being are not able to hear ) to detect the height of sea , if the transmitter dose not produce ultrasonic sound so how human being is able to find that the transmitter does produce sound as human being is not able to hear ultrasonic sound ??
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Answer:
the transmitter is first checked then only the ship is allowed to move further
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Explanation:
Yes , humans cannot hear ultrasonic sound...to detect it a device called SONAR is used.. hope it helps..
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