Question

The sounds having the frequency of 20 Hz to 20,000 Hz are
A) ultrasound
B) infrasonics
C) Hypersonics
D) Audible Sounds

Answer 1

Hint: The longitudinal wave in a medium is called the sound waves. The sound wave can only transmit in a medium and cannot travel without a medium. The human ears can experience the sound of a specific range. The sound frequency 20 Hz is called the lower audible limit, and 20,000 Hz is called the upper audible limit. The hearable range of the sound for humans is called the audible range. Humans cannot hear the sound out of the audible range.

Complete step by step answer:
The sound with the frequencies above the audible range for the humans is called the ultrasound. All the sounds with frequencies above the 20,000 Hz are the same as the ultrasound. The human ear cannot detect ultrasounds. The ultrasounds are used to detect the presence of objects. The ultrasound frequency lies outside the audible range, so the option (A) is incorrect.
All the sound waves with a frequency below the audible range's lower audible limit is called the infrasound, and the study of these sound waves is called infrasonic. The infrasonic sounds are used by the animals to communicate with each other. The infrasound frequency lies outside the audible range, so the option (B) is incorrect.
The sound waves with a frequency much greater than the upper limit of the audible range of sound are called the hyper sound, and the study of these frequencies is called hypersonic. The hypersound frequency lies outside the audible range, so the option (C) is incorrect.

All the sound waves with a frequency between the 20 Hz to 20,000 Hz are called the audible sounds, so the option (D) is correct.

Note:
Remember the value of the frequency in the audible range, and it is 20 Hz to 20,000 Hz. The speed of the sound lies in this audible range is the same as the speed of the sound. This range is also important to prevent the resonance in the sound.