For humans, the audible waves are those that:

Correct option is D

Ans. (d) have the frequency range between 20 Hz to 20000 Hz

Sol.
Humans are capable of hearing sound waves within a specific frequency range, known as the audible range. This range typically spans from 20 Hz to 20,000 Hz (20 kHz). Sounds with frequencies below 20 Hz are considered infrasound, and those above 20,000 Hz are considered ultrasound, neither of which can be heard by the human ear.

The lower end of the audible spectrum (20 Hz) corresponds to deep, low-pitched sounds, such as a rumble or bass notes in music, while the higher end (20,000 Hz) corresponds to higher-pitched sounds, like a dog whistle or the upper frequencies of musical instruments.

This frequency range can vary slightly between individuals, with some people losing the ability to hear higher frequencies as they age. However, 20 Hz to 20,000 Hz is generally accepted as the standard audible range for humans.

Information Booster:

• Infrasound (below 20 Hz): While not audible, infrasound can still affect humans in other ways, such as causing a sense of unease or discomfort.

• Ultrasound (above 20,000 Hz): Ultrasound is used in medical imaging (e.g., ultrasounds for pregnancy) and various industrial applications, but it is beyond the hearing range of humans.

• The threshold of hearing for a healthy human ear is around 0 decibels (dB), corresponding to the faintest sound that can be heard at 1,000 Hz.

• As humans age, they often experience a reduction in the upper frequency limit of their hearing, especially after the age of 30, with a common loss of sensitivity to higher frequencies.

• Decibels (dB) are used to measure the intensity of sound; sounds with higher dB levels are perceived as louder.

• Human hearing is most sensitive to frequencies between 1,000 Hz and 5,000 Hz, which is why speech sounds and music tend to have frequencies in this range.