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The range of frequency of audible or sonic vibrations is between 20 Hz to 20,000 Hz
A. True
B. False

Answer
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Hint: A human ear is only sensitive to a certain range of sonic vibrations because then only it can catch every minute pressure difference in the air.

Complete Step by step solution
The range of frequency between 20 Hz to 20,000 Hz is the range that a human ear can easily detect and hence sound waves with frequency of this range are called as Audible or Sonic vibrations. This is because a human ear is sensitive to every minute pressure difference in the air if they are in this frequency range.
Sound waves of frequency above 20,000 Hz are known as Ultrasonic vibrations. These vibrations are very useful in medical and metal industries.
Sound waves of frequency below 20 Hz are known as Infrasonic vibrations. Such types of vibrations are produced during earthquakes, thunder and volcanoes. Humans can’t hear in this range but some animals like whales and elephants can hear this.

Hence the answer is true

Note: Range from 20 Hz to 20,000 Hz is the Audible or Sonic vibrations range. Frequencies above 20,000 Hzare known as Ultra sonic and that below 20 Hz are known as Infrasonic vibrations.
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