Definition

1. Adjective:
   • Having frequencies below those of audible sound: Describes sound waves with a frequency lower than the lower limit of normal human hearing, typically below about 20 hertz (Hz).

Usage

• The adjective "infrasonic" is used to qualify nouns related to sound, vibration, or phenomena. It describes a specific physical property and is primarily used in scientific, technical, and environmental contexts.
• It is typically placed before the noun it modifies (e.g., ) or used after a linking verb like "is" or "are" (e.g., ).

Examples

• Adjective:
  • Elephants use infrasonic calls to communicate over long distances.
  • Scientists installed sensors to monitor infrasonic vibrations from the volcano.
  • Some natural phenomena, like earthquakes, produce infrasonic waves.

Advanced Usage

• "infrasonic frequency": a specific frequency value within the infrasonic range.
  • The device was calibrated to detect infrasonic frequencies as low as 5 Hz.
• "infrasonic noise": low-frequency sound that is inaudible but may be felt as vibrations.
  • The new wind farm was studied for its potential generation of infrasonic noise.

Variants and Related Words

• Infrasound (noun): Sound waves with infrasonic frequencies.
  • Infrasound from ocean waves can travel thousands of kilometers.
• Ultrasonic (adjective): Having frequencies above those of audible sound (the opposite of infrasonic).

Synonyms

• Subsonic (in specific acoustic contexts, though "subsonic" more commonly refers to speeds below the speed of sound).
• Low-frequency (a more general term that can include the lower end of audible sound).

Antonyms

• Ultrasonic: Having frequencies above the upper limit of human hearing.
• Audible: Able to be heard by the human ear.

Adjective

1. having frequencies below those of audible sound