GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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infrasonic
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ultrasonic
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supersonics
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audio sounds
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Detailed explanation-1: -Sounds having frequencies lower than 20 Hz are below audible level and hence are called infrasonic sound.
Detailed explanation-2: -Infrasound, sometimes referred to as low status sound, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz). Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high.
Detailed explanation-3: -Infrasonic waves: The frequency range of these types of waves is below 20Hz. Humans cannot detect it. Example: Sound produced by Earthquake, Volcanic eruption and ocean waves, etc.
Detailed explanation-4: -Sound of frequency above 20 kHz is called as ultrasonic whereas sound of frequency in between 20 Hz to 20 kHz is called as audio sound.