The difference between BTC and ACE

1. Mechanical resonance is transmitted through mechanical medium, such as sound wave. When one tuning fork is knocked, another tuning fork also has sound, which is the mechanical vibration caused by it. Due to the requirement of medium, mechanical resonance cannot be generated in vacuum, unlike electromagnetic wave, which does not need medium to transmit directly. In addition, we can think of why people take walkie talkies on the moon? Because mechanical waves cannot travel in a vacuum