Question

The audible range of frequency is
A. $\text{20 Hz to }20,000\text{Hz }$
B $40 \mathrm{Hz}$ to $40,000 \mathrm{Hz}$
C. $60\text{Hz to }60,000\text{Hz}$
D. $10 \mathrm{Hz}$ to $20,000 \mathrm{Hz}$

Answer 1

Hint: We know that sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. The motion of the particles is parallel (and anti-parallel) to the direction of the energy transport. This is what characterizes sound waves in air as longitudinal waves. Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

Complete step by step answer
We know that human ear can hear sound having frequency range from $20 \mathrm{Hz}$ to
$20 \mathrm{kHz}$. Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature; the upper limit in average adults is often closer to 15–17 kHz.)
As it is known that sound can be of different types—soft, loud, pleasant, unpleasant, musical, audible (can be heard), inaudible (cannot be heard), etc. Some sounds may fall into more than one category. For instance, the sound produced when an aeroplane takes off is both loud and unpleasant
So, human beings can't hear sound having frequency below $20 \mathrm{Hz}$ and above $20,000 \mathrm{Hz}$.

So, the correct answer is option A.

Note: We know that sound waves are vibrations that are transmitted through a medium, such as air, water, and metals. Ultrasonic waves are defined as inaudible sounds with high frequency for humans, the frequency of which generally exceeds 20 kHz. These days, sound waves which are not intended to be heard are also called ultrasonic wave. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine. In the non-destructive testing of products and structures, ultrasound is used to detect invisible flaws. Although Ultrasound cannot be heard by humans, at high decibels it can still cause direct damage to human ears. Ultrasound in excess of 120 decibels may cause Hearing damage. Exposure to 155 decibels causes heat levels that are harmful to the body. 180 decibels may even cause death.