If you were a teenager wanting to sneak around and receive text messages while in class, what would be the best way to get around your teacher's hearing?
A) Put your phone on vibrate, and hope the amplitude is low enough the teacher can't hear it.
B) Put on your cell-phone a ringtone that sounds at 17 kilohertz.
C) Make a lot of noise every time a message comes in to disguise the sound.
D) Set Brahms' lullaby as your ringtone and hope your teacher is sleepy.
Correct Answer:
Verified
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