The sounds acquiring far too lower frequencies which can't be listened to by human ear are called infrasonic sounds (or simply infrasonics). Rhinoceros can produce infrasonic sounds acquiring frequencies below twenty Hz. They may hear infrasonic sounds. Though the echoes produced by ultrasound cannot be heard by our ears, they https://vibration-isolator-for-fa70335.designi1.com/50631451/considerations-to-know-about-isolator-vibration-pad