Understanding Infrasonic Sound
Infrasonic sound refers to sound waves with frequencies below the lower limit of human audibility. The key characteristic defining infrasonic sound is its frequency.
Solution Breakdown
Let's analyze the options based on the definition of infrasonic sound:
- Option 1: Frequency between 20 Hz and 20 kHz - This range is typically considered the human audible frequency range. It is not infrasonic.
- Option 2: Frequency < 20 Hz - Sound waves with frequencies less than 20 Hz are defined as infrasonic. This aligns with the scientific definition.
- Option 3: Frequency > 20 kHz - Sound waves with frequencies greater than 20 kHz are known as ultrasonic sound.
- Option 4: Cannot travel in air - This is incorrect. Sound waves, including infrasonic ones, are mechanical waves that require a medium to travel and can propagate through air, liquids, and solids.
Conclusion on Infrasonic Sound
Based on the analysis, the defining characteristic of infrasonic sound is a frequency below 20 Hz. Therefore, Option 2 is the correct statement about infrasonic sound.
Important Questions from Physics
Two balls, A and B, are thrown simultaneously, a vertically upward with a speed of 20 m/s from the ground and B vertically downward from a height of 40 m with the same speed and along the same line of motion. At what points do the two balls collide by taking acceleration due to gravity as 9.8 m/s 2?
On the basis of which principle does soap clean surfaces?
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Who among the following has explained the phenomenon of photoelectric effect?
