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
it has loudness above 10 dB
it has loudness above 80 dB
it has a frequency below 20 Hz
it has a frequency above 20 kHz
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Answered by
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Answer:
it has frequency above 20khz
Explanation:
this is out of the rename of human hearing
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