Question

A student used the ultrasonic sound waves to transmit a message to his friend. What is the reason the sound is not heard by the student?
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Answer 1

Answer:

Ultrasonic sounds can not be heard by human ear

Explanation:

because the frequency of ultrasonic sounds is very high.

Answer 2

The ultrasonic sound waves are not heard by the student because:

• The normal range of hearing frequency for humans is between 20 Hertz and 20000Hertz or 20 Kilo Hertz.
• Ultrasonic sound waves have a frequency higher than 20 Kilo Hertz.
• This high-frequency sound wave is only audible to animals like dolphins, bats, dogs, etc
• Because the student used ultrasonic sound frequency to transmit messages it was not audible to his friend due to higher frequency than the range of humans.